Online English Vocabulary Flashcards for High School 8 Words
How to Use These Flashcards
Learn High School 8 vocabulary words with this free 75-card online vocabulary flashcard study set. Flip each flash card to see the part of speech, definition, and example sentence.
Click the speaker for audio pronunciation, and click any word for the full dictionary entry.
More Leaning Activities
Test your knowledge of High School 8 vocabulary words with online quizzes and spelling bee practice:
Flip the flashcards
Boost your word power with this High School vocabulary list for Grades 9-12. From 'acerbity' to 'weaken,' these 50 words will enrich your linguistic repertoire.
1/75
acerbity

Includes synonyms, etymology, and a detailed definition.
Part of Speech
Definition
Example Sentence
Complete Flashcards List for High School 8 with Definitions, POS, IPA, Examples, Synonyms, and Antonyms
acerbity (noun) /əˈsɜr bɪ ti/
Definition: A sharp, bitter, or harsh quality of speech, tone, or behavior.
Example Sentence: "The acerbity of his remarks left the audience stunned and uncomfortable."
Synonyms: acidity; acrimony; asperity; bite; bitterness; cynicism
Opposite Meaning: sweetness
actualize (verb) /ˈæk tʃu əˌlaɪz/
Definition: To bring something into existence or make it real.
Example Sentence: "By setting clear goals and taking action, you can actualize your aspirations."
Synonyms: accomplish; achieve; attain; complete; embody; execute
Opposite Meaning: neglect
adrift (adjective) /əˈdrɪft/
Definition: Being without direction, purpose, or stability.
Example Sentence: "The boat was found adrift in the middle of the ocean."
Synonyms: aimless; bewildered; castaway; directionless; disoriented; floating
Opposite Meaning: anchored
aftermath (noun) /ˈæf tərˌmæθ/
Definition: The period or consequences that occur immediately after a significant event or situation, particularly one that has caused disruption, destruction, or change.
Example Sentence: "The aftermath of the earthquake left the city in ruins and its residents in a state of shock."
Synonyms: aftereffects; backlash; conclusion; consequences; outcome; ramifications
Opposite Meaning: precursor
ambience (noun) /ˈambɪəns
Definition: The atmosphere or mood of a particular environment or setting.
Example Sentence: "The soft lighting and calming music created a relaxing ambience in the spa."
Synonyms: aura; character; climate; feeling; flavor; impression
Opposite Meaning: discordance
amenity (noun) /əˈmiːnɪti/
Definition: A feature or service that is provided for the comfort or convenience of people.
Example Sentence: "An on-site cafe is a convenient amenity for office workers."
Synonyms: accessory; accouterment; benefit; enhancement; enrichment; extra
Opposite Meaning: inconvenience
apparatus (noun) /ˌæp əˈræt əs/
Definition: A complex set of tools, equipment, or machinery used for a specific purpose or in a particular field of work.
Example Sentence: "The scientific research team used a sophisticated apparatus to measure the temperature changes."
Synonyms: appliance; contraption; device; equipment; gear; instruments
Opposite Meaning: disarray
atrocious (adjective) /əˈtroʊ ʃəs/
Definition: Extremely evil, cruel, or horrifying, often causing great shock or disgust.
Example Sentence: "The film received scathing reviews for its atrocious acting and poor storytelling."
Synonyms: abominable; appalling; despicable; detestable; dreadful; execrable
Opposite Meaning: commendable
avoid (verb) /əˈvɔɪd/
Definition: To intentionally stay away from or preventcontact, engagement, or interaction with someone or something.
Example Sentence: "He tried to avoid eye contact with his ex-partner at the party."
Synonyms: abstain; avert; bypass; circumvent; dodge; elude
Opposite Meaning: confront
bargain (noun) /ˈbɑr gən/
Definition: A mutually beneficial agreement or deal reached between two or more parties.
Example Sentence: "The local farmers' market is a fantastic place to get fresh produce at bargain prices."
Synonyms: agreement; arrangement; contract; deal; discount; negotiation
Opposite Meaning: rip-off
barricade (noun) /ˈbær ɪˌkeɪd/
Definition: A physical structure or obstacle set up to block, restrict, or control the movement of people, vehicles, or objects.
Example Sentence: "The police officer stood guard behind the barricade, keeping a watchful eye on the crowd."
Synonyms: barrier; blockade; dam; fence; fortification; hurdle
Opposite Meaning: opening
beg (verb) /bɛg/
Definition: To make a plea or earnest request for something, typically in a humble or desperate manner.
Example Sentence: "The stray dog would beg for scraps outside the restaurant."
Synonyms: appeal; beseech; crave; entreat; implore; importune
Opposite Meaning: refuse
blatant (adjective) /ˈbleɪtnt/
Definition: Done or shown in an obvious and intentional way, without any attempt to hide or disguise it.
Example Sentence: "The singer's blatant use of auto-tune was criticized by music critics."
Synonyms: brazen; conspicuous; glaring; noticeable; obtrusive; overt
Opposite Meaning: subtle
bloat (verb) /bloʊt/
Definition: To swell or enlarge something, often to an abnormal or excessive degree.
Example Sentence: "She noticed her belly beginning to bloat after the meal."
Synonyms: balloon; bilge; billow; bulk; dilate; distend
Opposite Meaning: deflate
circumambient (adjective) /ˌsɜr kəmˈæm bi ənt/
Definition: Surrounding or encompassing a particular area or object.
Example Sentence: "The circumambient chatter of the crowd filled the concert venue."
Synonyms: asphyxiate; block; constrict; gag; inhibit; obstruct
Opposite Meaning: enclosed
combination (noun) /ˌkɒm bəˈneɪ ʃən/
Definition: The act or result of joining or bringing together multiple elements, factors, or entities to create a unified whole.
Example Sentence: "The recipe called for a unique combination of spices."
Synonyms: amalgam; amalgamation; blend; compound; concoction; fusion
Opposite Meaning: separation
congeal (verb) /kənˈdʒiːl/
Definition: To transform a liquid or substance from a fluid or semi-liquid state into a solid or gel-like state as it cools or thickens.
Example Sentence: "Blood can congeal quickly when exposed to air, making it difficult to clean."
Synonyms: clot; coagulate; condense; curdle; freeze; gelatinize
Opposite Meaning: liquefy
convince (verb) /kənvɪns/
Definition: To persuade or cause someone to believe or agree with a particular idea, opinion, or course of action.
Example Sentence: "He tried to convince his parents to let him go on the trip with his friends."
Synonyms: cajole; coax; compel; encourage; entice; induce
Opposite Meaning: dissuade
decadence (noun) /ˈdɛkədəns/
Definition: A state of moral, cultural, or societal decline marked by excessive self-indulgence, luxury, or moral decay.
Example Sentence: "The empire's downfall was attributed to its leaders' excessive decadence and corruption."
Synonyms: corruption; debauchery; decay; decline; degeneration; depravity
Opposite Meaning: ascendance
dislike (verb) /dɪsˈlaɪk/
Definition: To feel negative, unfavorable, or aversive emotions towards someone or something.
Example Sentence: "She dislikes confrontation and prefers to avoid conflicts."
Synonyms: abhor; deprecate; despise; detest; disapprove; disdain
Opposite Meaning: enjoy
elite (noun) /ɪˈlit, eɪˈlit/
Definition: A select group or category of individuals who are considered superior or outstanding in a particular field, profession, or social status.
Example Sentence: "The elite athletes showcased their skills and competed for the championship title."
Synonyms: aristocracy; best; cream; gentry; nobility; privileged
Opposite Meaning: common
encompassing (adjective) /ɛnˈkʌm pə sɪŋ/
Definition: Comprehensive, wide-ranging, or inclusive in nature.
Example Sentence: "The all-encompassing view from the mountaintop took our breath away."
Synonyms: blanket; complete; comprehensive; extensive; global; inclusive
Opposite Meaning: limited
exemption (noun) /ɪɡˈzɛm(p)ʃn/
Definition: A status or privilege that excuses someone or something from fulfilling a particular requirement or obligation.
Example Sentence: "The medical exemption excused the athlete from the fitness test."
Synonyms: dispensation; exception; exclusion; immunity; impunity; indemnity
Opposite Meaning: obligation
exposure (noun) /ɪkˈspoʊ ʒər/
Definition: The state or condition of being subjected to or experiencing something, typically involving the contact or interaction with external elements, influences, or situations.
Example Sentence: "Her frequent exposure to different cultures broadened her perspective on the world."
Synonyms: demonstration; disclosure; display; divulgence; exhibition; manifestation
Opposite Meaning: protection
flawed (adjective) /flɔd/
Definition: Contains imperfections or shortcomings, undermining its overall quality, effectiveness, or integrity.
Example Sentence: "The flawed diamond had visible imperfections and irregularities, diminishing its value."
Synonyms: blemished; damaged; defective; deficient; erroneous; faulty
Opposite Meaning: flawless
fluid (noun) /ˈflu ɪd/
Definition: A substance that has the ability to flow and take the shape of its container.
Example Sentence: "The mechanic checked the car's brake fluid to ensure it was at the correct level."
Synonyms: broth; effusion; elixir; essence; juice; liquid
Opposite Meaning: solid
grating (adjective) /ˈgreɪ tɪŋ/
Definition: Irritating, harsh, or unpleasant to the senses, particularly to the ears.
Example Sentence: "The grating sound of nails scratching on a chalkboard made everyone cringe."
Synonyms: abrasive; annoying; disagreeable; discordant; harsh; irritating
Opposite Meaning: pleasant
haphazard (adjective) /hapˈhazəd/
Definition: Lacking order, planning, or organization, often occurring in a random, unplanned, or chaotic manner.
Example Sentence: "The haphazard layout of the website made it difficult to find information."
Synonyms: aimless; arbitrary; chance; chaotic; disorderly; disorganized
Opposite Meaning: planned
imitate (verb) /ˈɪm ɪˌteɪt/
Definition: To copy, mimick, or reproduce the actions, behavior, or characteristics of someone or something else.
Example Sentence: "The child tried to imitate the sound of a bird chirping."
Synonyms: ape; copy; echo; emulate; follow; impersonate
Opposite Meaning: originate
imponderable (adjective) /ɪmˈpɒndərəbᵊl/
Definition: Cannot be measured, weighed, or evaluated using traditional methods.
Example Sentence: "The imponderable beauty of the sunset left us speechless."
Synonyms: elusive; enigmatic; immeasurable; indefinable; indescribable; inexplicable
Opposite Meaning: measurable
inaudible (adjective) /ɪnˈɔ də bəl/
Definition: Cannot be heard or is difficult to hear due to being too quiet, faint, or obscured by other sounds.
Example Sentence: "The whispers exchanged between the spies were inaudible to anyone not wearing the specialized listening device."
Synonyms: faint; hushed; indistinct; low; muffled; muted
Opposite Meaning: audible
incongruence (noun) /ɪnˈkɒŋ gru əns/
Definition: A state or quality of being inconsistent, incompatible, or out of harmony with one's surroundings or expectations.
Example Sentence: "The incongruence of her beliefs with the company’s values led to her resignation."
Synonyms: conflict; contradiction; discordance; discrepancy; disparity; dissimilarity
Opposite Meaning: harmony
incorrect (adjective) /ˌɪn kəˈrɛkt/
Definition: Factually or logically wrong, inaccurate, or not in accordance with truth, reality, or established standards.
Example Sentence: "The incorrect spelling of the word led to confusion in the document."
Synonyms: erroneous; fallacious; false; faulty; flawed; improper
Opposite Meaning: correct
indigence (noun) /ˈɪndɪdʒ(ə)ns/
Definition: A state of extreme poverty or financial hardship, in which a person is unable to meet their basic needs for food, shelter, and clothing.
Example Sentence: "The homeless shelter provides a temporary refuge for those facing indigence."
Synonyms: beggary; deprivation; destitution; impoverishment; need; pauperism
Opposite Meaning: wealth
indignity (noun) /ɪnˈdɪg nɪ ti/
Definition: An act or treatment that is offensive, humiliating, or disrespectful, causing a loss of dignity or self-respect.
Example Sentence: "The elderly woman was subjected to the indignity of being ignored and dismissed by the hospital staff."
Synonyms: abuse; affront; disgrace; disgracefulness; disparagement; disrepute
Opposite Meaning: honor
individualistic (adjective) /ˌɪn dəˌvɪdʒ u əˈlɪs tɪk/
Definition: Individuality, independence, and self-reliance.
Example Sentence: "The artist's style is highly individualistic, showcasing unique and innovative techniques."
Synonyms: autonomous; distinctive; idiosyncratic; independent; maverick; nonconformist
Opposite Meaning: conformist
infantilize (verb) /ˈɪn fən tlˌaɪz/
Definition: To treat, portray, or address someone in a manner that reduces or diminishes their maturity, independence, or capabilities, often likening them to an infant or child.
Example Sentence: "The boss's constant micromanaging had a tendency to infantilize the employees."
Synonyms: belittle; condescend; control; demean; diminish; disempower
Opposite Meaning: empower
inhibition (noun) /ˌɪn ɪˈbɪʃ ən/
Definition: A feeling of restraint or self-control that prevents a person from engaging in a certain behavior or expressing certain thoughts or emotions.
Example Sentence: "After just one drink, she suddenly lost her usual social inhibition."
Synonyms: constraint; hesitancy; limitation; repression; reserve; reticence
Opposite Meaning: freedom
inroad (noun) /ˈɪnˌroʊd/
Definition: A significant or noticeable progress or advancement made in a particular field, discipline, or endeavor.
Example Sentence: "The diplomatic negotiations made inroads into fostering peaceful relations between the two countries."
Synonyms: advance; encroachment; foray; incursion; infiltration; infraction
Opposite Meaning: setback
instinct (noun) /ˈɪn stɪŋkt/
Definition: An innate, natural, and intuitive behavior or tendency that is inherent in animals and humans.
Example Sentence: "The mother bird's instinct led her to build a sturdy nest for her eggs."
Synonyms: compulsion; drive; gut; hunch; impulse; inclination
Opposite Meaning: learning
intoxicate (verb) /ɪnˈtɒksɪkeɪt/
Definition: To affect someone's mind or behavior by making them drunk or under the influence of a drug.
Example Sentence: "The allure of power can intoxicate even the most humble individuals."
Synonyms: arouse; befuddle; elate; excite; exhilarate; fuddle
Opposite Meaning: sober up
lacerate (verb) /ˈlæs əˌreɪt/
Definition: To cause deep, irregular cuts or wounds on the body or an object.
Example Sentence: "The thorns on the rose stem can easily lacerate your hands if you are not cautious."
Synonyms: cleave; cut; gash; incise; mangle; mutilate
Opposite Meaning: mend
linchpin (noun) /ˈlɪntʃˌpɪn/
Definition: A crucial or essential element that holds various parts or aspects of a system, organization, or plan together.
Example Sentence: "Education is often regarded as the linchpin for social progress and economic development."
Synonyms: anchor; centerpiece; core; cornerstone; crux; essential
Opposite Meaning: nonessential
liquidate (verb) /ˈlɪk wɪˌdeɪt/
Definition: To convert assets, typically in the form of property, investments, or inventory, into cash or cash equivalents.
Example Sentence: "They had to liquidate their investments to fund their new business venture."
Synonyms: cash; clear; close; convert; disburse; dispose
Opposite Meaning: retain
magazine (noun) /ˌmæg əˈzin/
Definition: A periodical publication that is issued on a regular basis, typically weekly, monthly, or quarterly.
Example Sentence: "The cooking magazine provided a variety of delicious recipes."
Synonyms: brochure; bulletin; digest; ezine; fanzine; gazette
Opposite Meaning: book
malevolence (noun) /məˈlɛvələns/
Definition: A feeling or expression of ill will, malice, or hostility towards others.
Example Sentence: "The villain's malevolence was evident in his twisted smile."
Synonyms: bitterness; cruelty; hatred; maliciousness; malignity; nastiness
Opposite Meaning: benevolence
monopolize (verb) /məˈnɒp əˌlaɪz/
Definition: To gain exclusive control or dominance over a particular market, industry, or resource, thereby eliminating or significantly reducing competition.
Example Sentence: "They strategically acquired smaller competitors to monopolize the industry."
Synonyms: command; control; corner; dominate; exclude; grab
Opposite Meaning: share
mysterious (adjective) /mɪˈstɪər i əs/
Definition: Enigmatic, puzzling, or difficult to understand or explain.
Example Sentence: "She received a mysterious package in the mail, without any return address."
Synonyms: arcane; baffling; clandestine; cryptic; enigmatic; inexplicable
Opposite Meaning: clear
naysayer (noun) /ˈneɪˌseɪ ər/
Definition: A person who habitually expresses negative or pessimistic views, particularly in the face of new ideas, proposals, or endeavors.
Example Sentence: "She refused to let the naysayers discourage her from pursuing her dreams."
Synonyms: antagonist; complainer; contrarian; critic; cynic; detractor
Opposite Meaning: optimist
nestle (verb) /ˈnɛs əl/
Definition: To position in a snug, cozy, and secure manner, typically by snuggling or settling comfortably into a particular space or against someone or something.
Example Sentence: "The puppies nestle against each other for warmth and comfort during the night."
Synonyms: burrow; cuddle; curl; embrace; huddle; lie
Opposite Meaning: separate
nickname (noun) /ˈnɪkˌneɪm/
Definition: An alternative name or familiar term used to refer to a person, often replacing their given name.
Example Sentence: ""Slick" was the perfect nickname for the smooth-talking salesman."
Synonyms: alias; appellation; byname; cognomen; epithet; handle
Opposite Meaning: formal name
niggle (verb) /ˈnɪg əl/
Definition: To find fault or express dissatisfaction with small or trivial matters.
Example Sentence: "Despite the positive feedback, the author couldn't help but niggle over a few typos in the manuscript."
Synonyms: bicker; carp; complain; criticize; fuss; gripe
Opposite Meaning: appreciate
nimble (adjective) /ˈnɪm bəl/
Definition: Quick, agile, and light-footed in movement.
Example Sentence: "The cat leaped with nimble precision, effortlessly landing on its feet."
Synonyms: agile; brisk; deft; dexterous; fleet; graceful
Opposite Meaning: clumsy
nonsensical (adjective) /nɒnsensɪkəl/
Definition: Lacking logic, reason, or coherence, often appearing absurd or meaningless.
Example Sentence: "The website's terms and conditions were written in such a nonsensical manner that users had no idea what they were agreeing to."
Synonyms: absurd; illogical; incoherent; irrational; ludicrous; meaningless
Opposite Meaning: logical
noon (noun) /nun/
Definition: The specific time of day when the sun is at its highest point in the sky.
Example Sentence: "The clock struck noon, and the town came alive with the sound of bells."
Synonyms: apex; lunchtime; meridian; midday; midriff; noontide
Opposite Meaning: midnight
obscurity (noun) /əbˈskyʊər ɪ ti/
Definition: The state or condition of being unknown, unnoticed, or lacking widespread recognition or understanding.
Example Sentence: "The actress rose from obscurity to become a household name overnight."
Synonyms: ambiguity; anonymity; darkness; hiddenness; inconspicuousness; indistinctness
Opposite Meaning: fame
obtrude (verb) /əbˈtruːd/
Definition: To force oneself or one's ideas onto others, often in an intrusive or unwelcome way.
Example Sentence: "It is impolite to obtrude yourself into someone else's conversation."
Synonyms: impose; infringe; intercede; interfere; interlope; interpose
Opposite Meaning: withdraw
opposite (adjective) /ˈɒp ə zɪt/
Definition: Directly contrary or completely different from another in nature, direction, or position.
Example Sentence: "The north and south poles are located at opposite ends of the Earth."
Synonyms: antithetical; conflicting; contradictory; contrary; converse; counter
Opposite Meaning: similar
outraged (noun) /ˈaʊt reɪdʒ/
Definition: A state or feeling of intense anger, shock, or indignation resulting from a perceived violation of moral, ethical, or social norms.
Example Sentence: "The parents were outraged when they discovered the unsafe conditions at their children's school."
Synonyms: anger; displeasure; fury; indignation; ire; offense
Opposite Meaning: pleased
primitive (adjective) /ˈprɪm ɪ tɪv/
Definition: Characterized by simplicity, primitiveness, or a lack of complexity or sophistication.
Example Sentence: "The primitive tools discovered by archaeologists shed light on ancient hunting techniques."
Synonyms: archaic; basic; crude; elementary; prehistoric; primal
Opposite Meaning: advanced
prostitute (noun) /ˈprɒs tɪˌtut/
Definition: An individual who engages in the exchange of sexual services for money or other forms of payment.
Example Sentence: "She chose to work as a prostitute to support her family financially."
Synonyms: cocotte; courtesan; doxy; escort; harlot; hooker
Opposite Meaning: abstainer
pucker (verb) /ˈpʌkər/
Definition: To gather or contract into small, tight folds or wrinkles, typically as a result of being squeezed or pinched.
Example Sentence: "She couldn't help but pucker her lips when tasting the sour lemon."
Synonyms: compress; contract; crease; crinkle; fold; furrow
Opposite Meaning: smooth
redeem (verb) /rɪˈdiːm/
Definition: To make something that was once flawed or negative, into something positive or valuable.
Example Sentence: "He hoped to redeem himself by volunteering for a good cause."
Synonyms: atone; compensate; convert; reclaim; recover; refurbish
Opposite Meaning: worsen
romance (noun) /roʊˈmæns/
Definition: A state or experience characterized by intense emotions, enchantment, and a sense of wonderment in the realm of affection and relationships.
Example Sentence: "They enjoyed a candlelit dinner, setting the stage for a night of romance."
Synonyms: adoration; affair; amorousness; ardor; attachment; courtship
Opposite Meaning: indifference
slumber (verb) /ˈslʌmbə/
Definition: To sleep or rest, especially in a light, peaceful and tranquil manner.
Example Sentence: "The slumber of the baby was peaceful and uninterrupted."
Synonyms: catnap; doze; drowse; hibernate; nap; repose
Opposite Meaning: wake
soften (verb) /ˈsɔ fən/
Definition: To make something less firm, rigid, or harsh in texture, appearance, or behavior.
Example Sentence: "A kind word can soften even the hardest of hearts."
Synonyms: alleviate; assuage; diminish; mellow; mitigate; moderate
Opposite Meaning: harden
supplant (verb) /səˈplænt/
Definition: To replace or substitute someone or something, often in a forceful or deceitful manner.
Example Sentence: "He hoped to supplant his rival as the company's top salesperson."
Synonyms: depose; dethrone; displace; oust; overthrow; remove
Opposite Meaning: retain
swoon (verb) /swun/
Definition: To be overcome with intense admiration, adoration, or another strong emotion.
Example Sentence: "The surprise gift made her swoon with happiness."
Synonyms: adore; captivate; cherish; enamor; enchant; entrance
Opposite Meaning: enliven
syphon (noun) /ˈsaɪfən/
Definition: A tube or pipe used to transfer liquids from one container to another by means of atmospheric pressure and gravity.
Example Sentence: "The mechanic used a syphon to remove the old oil from the car's engine."
Synonyms: channel; conduit; duct; funnel; hose; pipe
Opposite Meaning: source
unbeliever (noun) /ˌʌn bɪˈli vər/
Definition: An individual who does not believe in a particular concept, ideology, or religion.
Example Sentence: "The unbeliever challenged the religious leader's assertions, demanding evidence and logical reasoning."
Synonyms: agnostic; atheist; dissenter; doubter; freethinker; heathen
Opposite Meaning: believer
vandalism (noun) /ˈvæn dlˌɪz əm/
Definition: The act of deliberately and unlawfully damaging or destroying property, typically public or private, without the owner's consent.
Example Sentence: "The police arrested a group of teenagers for engaging in acts of vandalism in the downtown area."
Synonyms: damage; defacement; demolition; desecration; desolation; destruction
Opposite Meaning: preservation
venue (noun) /ˈvɛn yu/
Definition: A specific location or place where an event or activity takes place.
Example Sentence: "The wedding reception was held at a beautiful outdoor venue overlooking the lake."
Synonyms: arena; facility; ground; hall; locale; location
Opposite Meaning: nowhere
voracity (noun) /vɔˈræs ɪ ti/
Definition: An intense and insatiable hunger or desire for something, typically related to food, knowledge, or experiences.
Example Sentence: "She attacked the buffet with a voracity that surprised everyone."
Synonyms: appetite; avidity; avidness; craving; eagerness; gluttony
Opposite Meaning: satisfaction
vulgar (adjective) /ˈvʌl gər/
Definition: Crude, coarse, or lacking in refinement.
Example Sentence: "The comedian's jokes were often vulgar and crossed the line of decency."
Synonyms: coarse; crass; crude; indecent; lewd; lowbrow
Opposite Meaning: refined
weaken (verb) /ˈwi kən/
Definition: To reduce or diminish the strength, power, or effectiveness of something.
Example Sentence: "The storm's powerful winds began to weaken as it moved further inland."
Synonyms: debilitate; deteriorate; dilute; diminish; enfeeble; erode
Opposite Meaning: strengthen
