Online English Vocabulary Flashcards for High School 20 Words

affiliated (adjective) /əˈfɪl iˌeɪ tɪd/
Definition: Officially or closely associated with a particular organization, institution, group, or individual.
Example Sentence: "The company's affiliated branches around the world ensure global market presence."
Synonyms: allied; associated; attached; combined; connected; cooperative
Opposite Meaning: unaffiliated

auricular (adjective) /ɔˈrɪk yə lər/
Definition: Relating to the ear or the sense of hearing.
Example Sentence: "The auricular nerves transmit sound signals to the brain."
Synonyms: acoustic; audio; auditory; aural; eared; hearing
Opposite Meaning: visual

avaricious (adjective) /ˌavəˈrɪʃəs/
Definition: Having or showing an extreme and often selfish desire for wealth or material gain.
Example Sentence: "He ran an avaricious scheme to swindle unsuspecting pensioners out of their savings."
Synonyms: acquisitive; covetous; grasping; greedy; materialistic; mercenary
Opposite Meaning: generous

barometer (noun) /bəˈrɒmɪtə/
Definition: A scientific instrument used to measure atmospheric pressure.
Example Sentence: "As the storm approached, the barometer's needle plummeted."
Synonyms: benchmark; criterion; example; measure; metric; standard
Opposite Meaning: guess

blitz (verb) /blɪts/
Definition: To launch a sudden, intense, and overwhelming attack or offensive.
Example Sentence: "The marketing team planned to blitz social media with their new product campaign."
Synonyms: assail; assault; attack; bombard; charge; invade
Opposite Meaning: defend

careful (adjective) /ˈkɛər fəl/
Definition: Cautious, attentive, and meticulous in one's actions, decisions, or approach to a task or situation.
Example Sentence: "The surgeon performed the delicate procedure with careful precision."
Synonyms: attentive; cautious; circumspect; conscientious; considerate; exacting
Opposite Meaning: careless

carouse (verb) /kəˈraʊz/
Definition: To engage in boisterous and noisy merrymaking or revelry, often involving excessive drinking and indulgence in pleasure.
Example Sentence: "The sailors would carouse at the tavern after a long and successful voyage."
Synonyms: binge; carol; carolling; celebrate; frolic; jollify
Opposite Meaning: abstain

causality (noun) /kɔˈzæl ɪ ti/
Definition: The relationship between cause and effect, the principle that states that every event has a cause or multiple causes, and those causes lead to specific effects.
Example Sentence: "The economist studied the causality between interest rates and investment patterns."
Synonyms: causation; connection; relationship; linkage; correlation; consequence
Opposite Meaning: independence

conclusion (noun) /kənˈklu ʒən/
Definition: The final part or end of something, marking the point where all previous information, arguments, or events come to a resolution or closure.
Example Sentence: "After carefully analyzing the data, the scientists reached a surprising conclusion."
Synonyms: closing; decision; deduction; end; finale; inference
Opposite Meaning: beginning

condescend (verb) /ˌkɒn dəˈsɛnd/
Definition: To behave in a patronizing or superior manner towards others, often accompanied by a sense of superiority or arrogance.
Example Sentence: "It's important for experienced team members not to condescend to new recruits."
Synonyms: belittle; demean; deride; despise; mock; patronize
Opposite Meaning: respect

conspire (verb) /kənˈspʌɪə/
Definition: To secretly plan or collaborate with others to do something that is usually illegal or harmful.
Example Sentence: "Sometimes, it feels like the traffic lights conspire against me."
Synonyms: collude; connive; contrive; cooperate; devise; machinate
Opposite Meaning: act openly

constitution (noun) /ˌkɒn stɪˈtu ʃən/
Definition: A fundamental set of principles or established rules that govern the operation and organization of a nation, state, or organization.
Example Sentence: "The country's constitution guarantees freedom of speech and expression."
Synonyms: charter; code; doctrine; foundation; framework; governance
Opposite Meaning: anarchy

corsair (noun) /ˈkɔːsɛə/
Definition: A type of pirate or privateer who operated in the Mediterranean Sea and along the coasts of Europe during the 16th to 18th centuries.
Example Sentence: "With the wind in its sails, the corsair's ship glided swiftly through the Caribbean."
Synonyms: brigand; buccaneer; filibuster; freebooter; marauder; pirate
Opposite Meaning: lawman

default (noun) /dɪˈfɔlt/
Definition: A standard or predetermined option or state that occurs when no alternative choice or action is taken.
Example Sentence: "The computer program reset to its default settings after a system update."
Synonyms: automatic; common; conventional; customary; norm; ordinary
Opposite Meaning: alternative

dimwit (noun) /ˈdɪmˌwɪt/
Definition: A person who is regarded as lacking intelligence, common sense, or the ability to comprehend and understand things easily.
Example Sentence: "The team's progress was hindered by the dimwit's constant mistakes and lack of critical thinking."
Synonyms: blockhead; dolt; dunce; fool; halfwit; idiot
Opposite Meaning: genius

disburse (verb) /dɪsˈbɜrs/
Definition: To distribute or pay out funds, resources, or assets to individuals, organizations, or specific purposes.
Example Sentence: "The committee will meet to discuss how to disburse the fundraising proceeds."
Synonyms: allocate; allot; apportion; deliver; dispense; distribute
Opposite Meaning: hoard

disheveled (adjective) /dɪˈʃɛv əld/
Definition: Untidy, unkempt, or in a state of disarray.
Example Sentence: "Rosalind rushed into the meeting room with disheveled hair and a wrinkled blouse."
Synonyms: bedraggled; disarrayed; disordered; messy; mussed; rumpled
Opposite Meaning: tidy

disturb (verb) /dɪˈstɜrb/
Definition: To disrupt or unsettle a state of calm, peace, or order.
Example Sentence: "Please do not disturb me while I'm studying."
Synonyms: agitate; annoy; bother; discompose; disquiet; disrupt
Opposite Meaning: calm

ellipse (noun) /ɪˈlɪps/
Definition: A geometric shape formed by a curved and closed path in a plane.
Example Sentence: "The satellite's trajectory was plotted as an ellipse on the chart."
Synonyms: circlet; curve; egg; ellipsoid; loop; oblate
Opposite Meaning: line

endogenous (adjective) /ɛnˈdɒdʒɪnəs/
Definition: Originating or arising from within a particular system, organism, or entity, as opposed to being introduced from outside.
Example Sentence: "The endogenous production of insulin in the pancreas helps regulate blood sugar levels."
Synonyms: inborn; indigenous; inherent; innate; integral; internal
Opposite Meaning: external

ensuing (adjective) /ɛnˈsu ɪŋ/
Definition: Following or occurring as a result of something else, typically in a chronological or logical sequence.
Example Sentence: "He made an offensive comment, and the ensuing backlash from the public was swift."
Synonyms: after; consequent; following; forthcoming; later; next
Opposite Meaning: preceding

erstwhile (adjective) /ˈɜrstˌʰwaɪl/
Definition: Formerly or previously in a specific state, position, or condition.
Example Sentence: "The erstwhile champion was dethroned by a new rising star."
Synonyms: bygone; ex; former; late; old; onetime
Opposite Meaning: current

eternity (noun) /ɪˈtɜr nɪ ti/
Definition: A concept or state that represents endless or infinite duration, transcending the constraints of time and space.
Example Sentence: "The beauty of the starry night sky made them feel connected to the vastness of eternity."
Synonyms: ceaselessness; duration; endlessness; everlastingness; forever; immortality
Opposite Meaning: moment

gear (noun) /gɪər/
Definition: A broad range of equipment, tools, or apparatuses designed for specific tasks or activities.
Example Sentence: "The hiker packed his camping gear for the weekend adventure in the mountains."
Synonyms: accessories; apparatus; attire; belongings; equipment; machinery
Opposite Meaning: discard

genial (adjective) /ˈdʒin yəl/
Definition: Having a warm and friendly disposition or mannerism exhibited by a person.
Example Sentence: "The host greeted us with a genial smile, making us feel instantly at home."
Synonyms: affable; agreeable; amiable; congenial; cordial; friendly
Opposite Meaning: unfriendly

glint (noun) /glɪnt/
Definition: A quick flash or sparkle of light.
Example Sentence: "The child's eyes sparkled with a mischievous glint as he plotted a playful prank."
Synonyms: beam; flash; flicker; gleam; glisten; glitter
Opposite Meaning: dullness

gossamer (noun) /ˈɡɒsəmə/
Definition: Adelicate and lightweight fabric that is often used for clothing or decoration.
Example Sentence: "The light breeze made the gossamer curtains dance and sway."
Synonyms: airy; delicate; diaphanous; fine; flimsy; fragile
Opposite Meaning: heavy

graft (verb) /græft/
Definition: To work diligently or persistently, often with the aim of acquiring or achieving something.
Example Sentence: "The surgeon will graft a piece of skin from the patient's thigh to repair the burn wound."
Synonyms: apply; attach; blend; combine; fuse; grind
Opposite Meaning: laze

grassroots (noun) /ˈgræsˌruts/
Definition: The fundamental level or the ordinary people within a group, community, or society who possess a shared interest, cause, or goal.
Example Sentence: "The success of the project was attributed to the dedicated efforts of grassroots volunteers."
Synonyms: citizen; community; decentralized; informal; local; participatory
Opposite Meaning: elite

gratitude (noun) /ˈɡratɪtjuːd/
Definition: The quality of being thankful and appreciative of the good things in one's life.
Example Sentence: "Cultivating a sense of gratitude can help us appreciate the little things in life."
Synonyms: acknowledgment; appreciation; appreciativeness; contentment; goodwill; grace
Opposite Meaning: ingratitude

harsh (adjective) /hɑrʃ/
Definition: Severe, rough, or lacking gentleness or kindness.
Example Sentence: "The teacher's harsh criticism left the student feeling demoralized."
Synonyms: abrasive; brutal; gruff; inclement; rigorous; severe
Opposite Meaning: gentle

hateful (adjective) /ˈheɪt fəl/
Definition: Extreme dislike, animosity, or intense hostility towards another.
Example Sentence: "She couldn't bear the sight of his hateful glare, filled with contempt and disdain."
Synonyms: abhorrent; despicable; hostile; loathsome; malevolent; malicious
Opposite Meaning: lovable

hearsay (noun) /ˈhɪəseɪ/
Definition: Information that is not based on personal knowledge or firsthand experience but is rather passed along from another person.
Example Sentence: "The testimony was hearsay and not admissible as evidence in court."
Synonyms: buzz; disinformation; gossip; grapevine; noise; report
Opposite Meaning: fact

historical (adjective) /hɪˈstɔr ɪ kəl/
Definition: Relating to or connected with history.
Example Sentence: "The museum is home to a vast collection of historical artifacts."
Synonyms: ancient; antique; archaic; bygone; epochal; heritage
Opposite Meaning: current

horrendous (adjective) /hɔˈrɛn dəs, hɒ-/
Definition: Extremely shocking, dreadful, or terrible in nature.
Example Sentence: "The survivors of the plane crash endured a horrendous ordeal."
Synonyms: abominable; appalling; atrocious; awful; dreadful; frightful
Opposite Meaning: wonderful

immortal (adjective) /ɪˈmɔːtl/
Definition: Not subject to death or decay, and therefore considered eternal or everlasting.
Example Sentence: "The gods in Greek mythology were said to be immortal and lived forever."
Synonyms: deathless; enduring; imperishable; indestructible; lasting; perpetual
Opposite Meaning: mortal

impenetrable (adjective) /ɪmˈpɛnɪtrəbl/
Definition: Impossible to pass through, break into, or understand, typically due to extreme density, toughness, complexity, or obscurity.
Example Sentence: "The fortress was protected by an impenetrable wall that kept out invaders."
Synonyms: bulletproof; hermetic; impassable; impermeable; impervious; inaccessible
Opposite Meaning: permeable

imperfection (noun) /ˌɪm pərˈfɛk ʃən/
Definition: A flaw, blemish, or defect in something or someone.
Example Sentence: "The diamond had a tiny imperfection that gave it a unique sparkle."
Synonyms: blemish; blunder; defect; deficiency; error; fault
Opposite Meaning: perfection

incentivize (verb) /ɪnˈsɛn tɪˌvaɪz/
Definition: To provide motivation or rewards in order to encourage certain behavior or actions.
Example Sentence: "The app offers rewards and discounts to incentivize users to invite their friends to join."
Synonyms: drive; encourage; galvanize; incite; inspire; motivate
Opposite Meaning: discourage

inclusion (noun) /ɪnˈkluːʒən/
Definition: The act or process of embracing and incorporating individuals of diverse backgrounds, identities, and abilities into a welcoming and supportive environment.
Example Sentence: "Inclusion promotes a sense of belonging for everyone."
Synonyms: integration; incorporation; diversity; acceptance; participation; encompassment
Opposite Meaning: exclusion

infancy (noun) /ˈɪn fən si/
Definition: The beginning or nascent phase of a process, idea, or entity.
Example Sentence: "The startup company faced many challenges in its infancy but eventually grew into a successful business."
Synonyms: beginning; birth; commencement; dawn; emergence; genesis
Opposite Meaning: maturity

inquest (noun) /ˈɪn kwɛst/
Definition: A formal legal inquiry or investigation conducted by a coroner or other authorized official to determine the cause, circumstances, and manner of an accident or death.
Example Sentence: "The coroner conducted a thorough inquest to determine the cause of the mysterious fire."
Synonyms: analysis; autopsy; dissection; examination; hearing; inquiry
Opposite Meaning: disregard

in-memoriam (noun) /ˌɪn mɪˈmɔːrɪam/
Definition: A tribute or memorial that is dedicated to the memory of a deceased person.
Example Sentence: "The concert was dedicated in memoriam to the late musician."
Synonyms: commemoration; commemorative; homage; honoring; memorial; memorialization
Opposite Meaning: birth announcement

isolate (verb) /ˈʌɪsəleɪt/
Definition: To set apart, separate, or detach something or someone from its surroundings, context, or companions.
Example Sentence: "The prisoners were put in solitary confinement to isolate them from other inmates."
Synonyms: confine; detach; disconnect; disunite; divorce; insulate
Opposite Meaning: integrate

jilt (verb) /ʤɪlt/
Definition: To reject or abandon someone or something in a sudden and callous way, especially in a romantic relationship.
Example Sentence: "She felt it was better to jilt him now than after the wedding."
Synonyms: betray; desert; disappoint; discard; ditch; drop
Opposite Meaning: commit

knickknack (noun) /ˈnɪkˌnæk/
Definition: A small decorative item or trinket, often considered to have little practical value but cherished for its aesthetic appeal or sentimental significance.
Example Sentence: "Each knickknack on the mantelpiece had a story to tell."
Synonyms: bauble; bibelot; bric-a-brac; curio; doodad; gewgaw
Opposite Meaning: essential

lingo (noun) /ˈlɪŋ goʊ/
Definition: A specialized or distinctive vocabulary, jargon, or set of terms used within a particular profession, group, or community.
Example Sentence: "The IT professionals used technical lingo that was difficult for others to understand."
Synonyms: argot; cant; dialect; idiom; jargon; language
Opposite Meaning: standard language

livelihood (noun) /ˈlaɪv liˌhʊd/
Definition: The means or source of income or sustenance by which individuals or households support themselves and meet their basic needs.
Example Sentence: "Tourism plays a vital role in supporting the local livelihoods in the coastal town."
Synonyms: career; employment; income; job; living; means
Opposite Meaning: dependency

mask (noun) /mæsk/
Definition: A covering or piece of material that is worn over the face, typically for protection, concealment, or disguise.
Example Sentence: "The bank robber used a mask to conceal their identity during the heist."
Synonyms: camouflage; concealment; disguise; façade; guise; masquerade
Opposite Meaning: reveal

maudlin (adjective) /ˈmɔːdlɪn/
Definition: Overly sentimental, emotional, or tearful in a way that is considered insincere or exaggerated.
Example Sentence: "The conversation took a maudlin turn as they started to reminisce about the past."
Synonyms: cloying; drippy; mawkish; mushy; overemotional; saccharine
Opposite Meaning: unsentimental

memorabilia (noun) /ˌmɛm ər əˈbɪl i ə/
Definition: A collection of items, objects, or souvenirs that hold significance or sentimental value due to their association with a particular event, person, or period.
Example Sentence: "She cherished the box of memorabilia from her travels, filled with postcards, ticket stubs, and small trinkets."
Synonyms: artifacts; belongings; collectibles; curios; keepsakes; mementos
Opposite Meaning: trash

morality (noun) /mərælɪti/
Definition: The principles, values, and beliefs that guide human behavior and distinguish between right and wrong actions.
Example Sentence: "Personal morality guides our actions and shapes our character."
Synonyms: conscience; decency; ethics; goodness; integrity; principles
Opposite Meaning: immorality

morphological (noun) /mɔrˈfɒl ə dʒi/
Definition: The study or analysis of the structure, form, and relationships of words or linguistic units within a language.
Example Sentence: "The researcher discovered an interesting morphological rule governing verb conjugation."
Synonyms: derivational; etymological; formative; grammatical; inflectional; lexical
Opposite Meaning: unstructured

mystical (adjective) /ˈmɪstɪkl/
Definition: Relating to mystery, mysticism, or spirituality.
Example Sentence: "The ancient temple was filled with mystical symbols and carvings."
Synonyms: enchanting; magical; metaphysical; mysterious; occult; otherworldly
Opposite Meaning: mundane

nameless (adjective) /ˈneɪm lɪs/
Definition: Lacking a specific or known name.
Example Sentence: "The distant mountain range was adorned with nameless peaks, each holding its own mystery."
Synonyms: anonymous; faceless; incognito; unacknowledged; unidentified; unknown
Opposite Meaning: famous

natter (verb) /ˈnæt ər/
Definition: To engage in casual, often rambling, and inconsequential conversation or chatter.
Example Sentence: "The ladies would often gather at the café to natter over a cup of tea."
Synonyms: babble; blabber; blather; chat; chatter; chitchat
Opposite Meaning: be silent

neighboring (adjective) /ˈneɪ bər ɪŋ/
Definition: Located or situated in close proximity to another person, place, or thing.
Example Sentence: "The neighboring schools often compete in sports events and academic competitions."
Synonyms: abutting; adjacent; adjoining; bordering; close; conterminous
Opposite Meaning: distant

notice (verb) /ˈnoʊ tɪs/
Definition: To perceive or become aware of something through one's senses or attention.
Example Sentence: "We notice the birds chirping outside our window every morning."
Synonyms: behold; catch; detect; discern; glimpse; identify
Opposite Meaning: ignore

peculiarity (noun) /pɪˌkyʊ liˈær ɪ ti/
Definition: A distinctive or unusual quality, characteristic, or behavior that sets someone or something apart from the norm.
Example Sentence: "Her habit of collecting vintage typewriters was one of her most cherished peculiarities."
Synonyms: abnormality; anomaly; deviation; distinctiveness; eccentricity; idiosyncrasy
Opposite Meaning: normality

perimeter (noun) /pəˈrɪm ɪ tər/
Definition: The boundary or outer edge of a closed or geometric shape.
Example Sentence: "The police set up a perimeter around the crime scene to restrict access."
Synonyms: border; boundary; brink; circumference; confines; edge
Opposite Meaning: center

pessimist (noun) /ˈpɛsɪmɪst/
Definition: A person who tends to expect the worst in any given situation and sees the negative aspects of life more than the positive.
Example Sentence: "The pessimist struggled to find the good in any situation."
Synonyms: complainer; cynic; defeatist; depreciator; doomster; downer
Opposite Meaning: optimist

preceding (adjective) /prɪˈsi dɪŋ/
Definition: Coming before or preceding another thing in order, time, or sequence.
Example Sentence: "The preceding year's sales figures were used as a benchmark for measuring growth."
Synonyms: antecedent; anterior; earlier; foregoing; former; past
Opposite Meaning: subsequent

proprietary (adjective) /prəˈprʌɪət(ə)ri/
Definition: Owned or controlled by a particular person or organization.
Example Sentence: "The company's proprietary technology gave them a competitive advantage."
Synonyms: confidential; copyright; exclusive; individual; patented; personal
Opposite Meaning: communal

prospectus (noun) /prəˈspɛk təs/
Definition: A printed booklet or brochure that serves to inform and attract potential students, parents, or investors.
Example Sentence: "The company distributed a detailed prospectus to potential investors, outlining its growth plans and financial projections."
Synonyms: booklet; brochure; catalog; document; dossier; exposition
Opposite Meaning: concealment

quadrangle (noun) /ˈkwɒdˌræŋ gəl/
Definition: A four-sided enclosed space or courtyard, typically surrounded by buildings or walls.
Example Sentence: "The quadrangle at the center of the university campus was bustling with activity."
Synonyms: atrium; campus; cloister; court; courtyard; enclosure
Opposite Meaning: enclosure

regardless (adverb) /rɪˈgɑrd lɪs/
Definition: Lacking consideration or attention to a particular factor or circumstance.
Example Sentence: "He pursued his dreams regardless of the naysayers."
Synonyms: anyhow; anyway; indiscriminately; irrespective; nevertheless; nonetheless
Opposite Meaning: mindful

restful (adjective) /ˈrɛst fəl/
Definition: Promoting or inducing a state of relaxation, calmness, or peacefulness.
Example Sentence: "The peaceful garden provided a restful spot for reading and relaxation."
Synonyms: calm; leisurely; peaceful; placid; quiet; relaxing
Opposite Meaning: agitating

reverberate (verb) /rɪˈvəːbəreɪt/
Definition: To resound or echo repeatedly, typically as a result of a sound or vibration being reflected or bouncing back from a surface.
Example Sentence: "Sound waves from the orchestra reverberate off the back wall of the auditorium."
Synonyms: echo; oscillate; pulsate; rebound; reecho; reflect
Opposite Meaning: absorb

sadness (noun) /ˈsæd nɪs/
Definition: An emotional state characterized by feelings of sorrow, unhappiness, or melancholy.
Example Sentence: "He found solace in writing poetry as an outlet for his sadness."
Synonyms: anguish; blues; dejection; desolation; despair; grief
Opposite Meaning: happiness

scholastic (adjective) /skəˈlæs tɪk/
Definition: Pertaining to academic or educational matters.
Example Sentence: "Her scholastic achievements earned her a full scholarship to Harvard."
Synonyms: academic; bookish; cerebral; educational; erudite; intellectual
Opposite Meaning: uneducated

selection (noun) /sɪˈlɛk ʃən/
Definition: The act or process of carefully choosing or picking out something or someone from a group or range of options.
Example Sentence: "The selection of candidates for the scholarship was rigorous and thorough."
Synonyms: assortment; choice; culling; curation; decision; electing
Opposite Meaning: rejection

shock (noun) /ʃɒk/
Definition: A sudden and intense disturbance or impact that causes a profound emotional, physical, or psychological reaction in an individual.
Example Sentence: "The earthquake caused widespread shock and panic throughout the city."
Synonyms: astonishment; awe; dismay; disturbance; impact; jolt
Opposite Meaning: calm

spoof (noun) /spuːf/
Definition: A comedic imitation of something, such as a film, a song, or a news broadcast.
Example Sentence: "The comedy sketch did a spoof of a popular reality TV show."
Synonyms: burlesque; caricature; fake; hoax; joke; lampoon
Opposite Meaning: homage

suspense (noun) /səˈspɛns/
Definition: A feeling of uncertainty or excitement about what is going to happen next, often associated with movies, books, or plays.
Example Sentence: "By the climax of the film, the suspense had built to an almost unbearable peak."
Synonyms: anticipation; anxiety; apprehension; doubt; expectancy; expectation
Opposite Meaning: predictability

tinted (adjective) /ˈtɪntɪd /
Definition: Having been colored or shaded with a particular hue or tone.
Example Sentence: "She wore a pair of stylish, tinted sunglasses to shield her eyes from the bright sunlight."
Synonyms: colored; dyed; hued; imbued; pigmented; shaded
Opposite Meaning: plain