Online English Vocabulary Flashcards for High School 18 Words

affluence (noun) /ˈæf lu əns/
Definition: A state of abundance, wealth, or prosperity, typically characterized by a high standard of living and the possession of considerable material resources.
Example Sentence: "The neighborhood exuded an air of affluence, with its lavish mansions and luxury cars."
Synonyms: abundance; fortune; luxury; opulence; plenty; prosperity
Opposite Meaning: poverty

aggressive (adjective) /əˈgrɛs ɪv/
Definition: Forceful, assertive, or confrontational in nature.
Example Sentence: "The aggressive argument escalated into a heated shouting match."
Synonyms: assertive; combative; competitive; confrontational; determined; feisty
Opposite Meaning: passive

agile (adjective) /ˈædʒ əl/
Definition: Moving quickly, efficiently, and adaptively.
Example Sentence: "The agile entrepreneur quickly adapted their business model to meet the shifting market demands."
Synonyms: adaptable; dexterous; fleet; flexible; lithe; lively
Opposite Meaning: clumsy

altruism (noun) /ˈæltruɪzᵊm/
Definition: The selfless concern for the well-being and welfare of others.
Example Sentence: "Acts of altruism can create a ripple effect of kindness and compassion."
Synonyms: benevolence; charity; compassion; empathy; generosity; goodwill
Opposite Meaning: selfishness

articulated (adjective) /ɑːˈtɪkjʊleɪtɪd/
Definition: Connected or joined together in a way that allows for flexibility and movement.
Example Sentence: "The bus was an articulated vehicle with two sections connected by a hinge."
Synonyms: attached; bendable; coupled; hinged; jointed; linked
Opposite Meaning: rigid

ashamed (adjective) /əˈʃeɪmd/
Definition: Deep regret, guilt, or embarrassment resulting from one's actions, words, or perceived shortcomings.
Example Sentence: "He felt ashamed when he realized he had lied to his parents."
Synonyms: abashed; chagrined; contrite; embarrassed; guilty; humiliated
Opposite Meaning: proud

balderdash (noun) /ˈbɔl dərˌdæʃ/
Definition: Senseless, nonsensical, or absurd talk or writing.
Example Sentence: "His explanation for his tardiness was pure balderdash."
Synonyms: blather; bunk; claptrap; drivel; gibberish; hogwash
Opposite Meaning: truth

byname (noun) /ˈbaɪˌneɪm/
Definition: An additional or alternative name given to a person, often as a descriptive or informal term.
Example Sentence: "In medieval times, knights were often referred to by their bynames."
Synonyms: alias; appelation; cognomen; designation; epithet; handle
Opposite Meaning: formal name

cancel (verb) /ˈkæn səl/
Definition: To terminate, void, or revoke something that was previously arranged, planned, or scheduled.
Example Sentence: "They had to cancel the flight due to severe weather conditions."
Synonyms: abandon; abolish; annul; countermand; negate; nullify
Opposite Meaning: proceed

carriage (noun) /ˈkær ɪdʒ/
Definition: A vehicle designed for transporting people or goods.
Example Sentence: "The horse-drawn carriage made its way gracefully through the cobblestone streets."
Synonyms: caboose; cart; chariot; coach; compartment; conveyance
Opposite Meaning: stagnation

chamber (noun) /ˈtʃeɪm bər/n
Definition: A room, space, or enclosed area that is typically distinct from surrounding areas.
Example Sentence: "The bullet was fired from the chamber of the gun."
Synonyms: box; cavity; cell; compartment; cubicle; enclosure
Opposite Meaning: open space

contradiction (noun) /ˌkɒn trəˈdɪk ʃən/
Definition: A situation or statement in which two or more elements, ideas, or facts are mutually exclusive or conflict with one another.
Example Sentence: "The politician's statement was a blatant contradiction of his earlier position on the issue."
Synonyms: clash; conflict; dichotomy; disagreement; discord; discrepancy
Opposite Meaning: agreement

corrupt (adjective) /kəˈrʌpt/
Definition: Morally compromised, dishonest, or involved in unethical practices.
Example Sentence: "The corrupt politician was involved in multiple bribery scandals."
Synonyms: bribeable; crooked; depraved; dishonest; fraudulent; immoral
Opposite Meaning: honest

customary (adjective) /ˈkʌstəm(ə)ri/
Definition: In accordance with prevailing social conventions or cultural practices.
Example Sentence: "It is customary to remove your shoes before entering the temple."
Synonyms: accepted; accustomed; acknowledged; common; conventional; established
Opposite Meaning: unusual

dainty (adjective) /ˈdeɪnti/
Definition: Delicate, small, and often characterized by a sense of refinement and elegance.
Example Sentence: "The restaurant served dainty appetizers before the main course."
Synonyms: charming; cute; exquisite; fine; frail; graceful
Opposite Meaning: clumsy

defer (verb) /dɪˈfɜr/
Definition: To delay or postpone something, often by choice or as a matter of respect or courtesy to another person's wishes, authority, or priority.
Example Sentence: "He decided to defer his enrollment at the university for a year."
Synonyms: adjourn; extend; hesitate; procrastinate; prolong; prorogue
Opposite Meaning: expedite

dilatory (adjective) /ˈdɪlət(ə)ri/
Definition: Characterized by a tendency to delay, procrastinate, or be slow in taking action.
Example Sentence: "His dilatory response to the urgent email led to unnecessary delays."
Synonyms: dallying; dawdling; leisurely; procrastinating; slack; sluggish
Opposite Meaning: prompt

disturbance (noun) /dɪˈstɜr bəns/
Definition: A state or condition of disruption, agitation, or interference with the normal functioning or peaceful nature of something.
Example Sentence: "The emotional disturbance experienced by the grieving family was evident in their tearful expressions."
Synonyms: agitation; commotion; disarray; discord; disruption; inconvenience
Opposite Meaning: peace

drool (verb) /drul/
Definition: To allow saliva to flow or drip uncontrollably from one's mouth.
Example Sentence: "The dog would drool uncontrollably while waiting for its meal."
Synonyms: dribble; flow; gurgle; gush; ooze; salivate
Opposite Meaning: swallow

encouraging (adjective) /ɪnˈkʌrɪʤɪŋ/
Definition: Providing support, motivation, or inspiration.
Example Sentence: "The encouraging atmosphere in the classroom allowed students to express their ideas freely."
Synonyms: cheering; emboldening; empowering; heartening; inspiring; invigorating
Opposite Meaning: disheartening

enlarge (verb) /ɛnˈlɑrdʒ/
Definition: To make something bigger, larger, or more expansive in size, dimensions, or scale.
Example Sentence: "The tailor had to enlarge the waistband of the pants to make them fit properly."
Synonyms: amplify; augment; broaden; escalate; expand; extend
Opposite Meaning: reduce

exponential (adjective) /ˌɛkspə(ʊ)ˈnɛnʃl/
Definition: Describing a rapid and significant increase or growth that occurs at an accelerating rate over time.
Example Sentence: "The world's population has been growing at an exponential rate for centuries."
Synonyms: ascending; expanding; explosive; growing; mounting; rampant
Opposite Meaning: linear

fluke (noun) /fluk/
Definition: A stroke of luck or an unexpected, fortunate occurrence.
Example Sentence: "The tennis player's shot was a lucky fluke that landed right on the line."
Synonyms: accident; blessing; chance; coincidence; fortuity; fortune
Opposite Meaning: certainty

gumption (noun) /ˈgʌmp ʃən/
Definition: A remarkable quality of individual initiative, resourcefulness, and determination.
Example Sentence: "It takes gumption to admit your mistakes and learn from them."
Synonyms: ambition; boldness; courage; determination; drive; fortitude
Opposite Meaning: apathy

hollow (adjective) /ˈhɒl oʊ/
Definition: Relating to a void or empty space within an object or structure.
Example Sentence: "His words felt hollow and insincere, lacking any genuine emotion."
Synonyms: barren; concave; desolate; echoing; empty; hollowness
Opposite Meaning: solid

howl (verb) /haʊl/
Definition: To emit a deep, eerie, and often haunting vocalization that carries over long distances.
Example Sentence: "The storm intensified, causing the winds to howl and the trees to sway."
Synonyms: bawl; bellow; cry; lament; roar; scream
Opposite Meaning: whisper

illegitimate (adjective) /ˌɪlɪˈdʒɪtɪmət/
Definition: Lacking proper authorization, validity, or legality, often due to a lack of adherence to established rules, norms, or procedures.
Example Sentence: "The actor was accused of fathering an illegitimate child with his mistress."
Synonyms: illegal; illicit; improper; incorrect; spurious; unauthorized
Opposite Meaning: legitimate

immaterial (adjective) /ˌɪməˈtɪərɪəl/
Definition: Not relevant, significant, or important in a particular context or situation.
Example Sentence: "The slight delay was immaterial in the grand scheme of things."
Synonyms: extraneous; inconsequential; inconsiderable; insignificant; irrelevant; meaningless
Opposite Meaning: pertinent

immense (adjective) /ɪˈmɛns/
Definition: Extraordinarily large in size, extent, or magnitude.
Example Sentence: "The hiker marveled at the immense size of the ancient redwood trees."
Synonyms: colossal; enormous; expansive; gigantic; huge; mammoth
Opposite Meaning: small

impromptu (adjective) /ɪmˈprɒm(p)tjuː/
Definition: Done or spoken without preparation or advance planning.
Example Sentence: "The band played an impromptu jam session during their break."
Synonyms: ad-lib; extemporaneous; extemporary; extemporized; improvised; offhand
Opposite Meaning: planned

infamy (noun) /ˈɪn fə mi/
Definition: A state or quality of being well-known or remembered for a negative reason or an act that is widely regarded as shameful, disgraceful, or morally reprehensible.
Example Sentence: "The corrupt official's infamy was widely known, but their power and influence shielded them from facing justice."
Synonyms: condemnation; discredit; disgrace; dishonor; disrepute; ignominy
Opposite Meaning: honor

infatuated (adjective) /ɪnˈfatjʊeɪtɪd/
Definition: Intense but short-lived admiration or attraction towards someone.
Example Sentence: "She was infatuated with him from the moment they met."
Synonyms: besotted; captivated; eager; enamored; enraptured; enthusiastic
Opposite Meaning: indifferent

inflate (verb) /ɪnˈfleɪt/
Definition: To increase or expand the size, volume, or quantity of something, often by introducing air or gas.
Example Sentence: "The company tried to inflate its sales figures to attract investors."
Synonyms: amplify; augment; bloat; boost; distend; enlarge
Opposite Meaning: deflate

infringement (noun) /ɪnˈfrɪndʒ mənt/
Definition: The act of violating or breaching a legal or moral principle, right, or privilege, typically relating to intellectual property, copyrights, patents, or trademarks.
Example Sentence: "The company filed a lawsuit against their competitor for copyright infringement."
Synonyms: breach; contravention; disregard; encroachment; infraction; intrusion
Opposite Meaning: compliance

install (verb) /ɪnˈstɔl/
Definition: To set up, place, or fit something, typically equipment, machinery, software, or systems, in a designated location or position.
Example Sentence: "They're going to install a security camera above the garage."
Synonyms: arrange; attach; deploy; embed; fix; implement
Opposite Meaning: remove

irrelevant (adjective) /ɪˈrɛl ə vənt/
Definition: Not connected, applicable, or pertinent to the matter at hand.
Example Sentence: "The age of the applicant is irrelevant as long as they possess the required skills."
Synonyms: extraneous; immaterial; inapplicable; inconsequential; insignificant; negligible
Opposite Meaning: pertinent

luscious (adjective) /ˈlʌʃ əs/
Definition: Highly pleasing to the senses, particularly the sense of taste or touch.
Example Sentence: "The luscious green meadows stretched as far as the eye could see."
Synonyms: delectable; delicious; divine; flavorful; mouthwatering; savory
Opposite Meaning: bland

macho (adjective) /ˈmɑ tʃoʊ/
Definition: Associated with exaggerated masculinity or traditional male stereotypes.
Example Sentence: "He walked into the room with a macho swagger, exuding confidence."
Synonyms: aggressive; assertive; brave; dominant; manly; masculine
Opposite Meaning: effeminate

manumit (verb) /ˌmæn yəˈmɪt/
Definition: To legally free or emancipate a person from slavery or servitude.
Example Sentence: "In ancient Rome, some slave owners chose to manumit their slaves as a reward for loyalty."
Synonyms: deliver; discharge; disenthrall; emancipate; enfranchise; free
Opposite Meaning: enslave

memento-mori (noun) /məˈmɛn toʊ ˈmɔr aɪ/
Definition: An object or symbol intended to serve as a reminder of the inevitability of death and the transient nature of life.
Example Sentence: "She wore a memento-mori pendant around her neck as a reminder to live each day to the fullest."
Synonyms: emblem; keepsake; memorial; momento; relic; remembrance
Opposite Meaning: life-celebration

messy (adjective) /ˈmɛs i/
Definition: Disorganized, untidy, or disorderly in appearance or condition.
Example Sentence: "The kitchen was a messy disaster after the cooking experiment."
Synonyms: chaotic; cluttered; disarrayed; disheveled; disorganized; haphazard
Opposite Meaning: neat

montage (noun) /mɒnˈtɑʒ/
Definition: The technique or process of combining various images, sounds, or elements to create a unified and often expressive visual or auditory composition.
Example Sentence: "The film's opening credits included a stylish montage of cityscape shots."
Synonyms: amalgamation; arrangement; assemblage; collage; collection; combination
Opposite Meaning: singularity

monumental (adjective) /ˌmɒn yəˈmɛn tl/
Definition: Of great significance, importance, or magnitude.
Example Sentence: "The construction of the pyramids was a monumental feat of engineering."
Synonyms: colossal; extraordinary; grand; immense; impressive; massive
Opposite Meaning: insignificant

motto (noun) /ˈmɒt oʊ/
Definition: A short, memorable phrase or expression that embodies the guiding principles, values, or aspirations of an individual, group, organization, or institution.
Example Sentence: "Their family motto was "Strength in Unity.""
Synonyms: aphorism; axiom; byword; catchphrase; creed; mantra
Opposite Meaning: ramble

muggy (adjective) /ˈmʌg i/
Definition: Characterized by high humidity and a sense of dampness or stickiness in the air.
Example Sentence: "The muggy weather made it uncomfortable to be outside for long."
Synonyms: airless; clammy; close; damp; heavy; humid
Opposite Meaning: dry

notable (adjective) /ˈnoʊ tə bəl/
Definition: Worthy of attention, recognition, or distinction due to significant or remarkable qualities, achievements, or characteristics.
Example Sentence: "The author's latest novel received notable acclaim from critics and readers alike."
Synonyms: celebrated; distinguished; eminent; famous; noteworthy; outstanding
Opposite Meaning: unremarkable

obsessed (adjective) /əbˈsɛst/
Definition: Consumed or preoccupied with a particular thought, idea, or person.
Example Sentence: "He was obsessed with cleanliness, sanitizing every surface multiple times a day."
Synonyms: addicted; compulsive; consumed; devoted; fanatic; fanatical
Opposite Meaning: indifferent

occultism (noun) /əˈkʌl tɪz əm/
Definition: The study, practice, or belief in hidden or secret knowledge, supernatural powers, and mystical or esoteric principles.
Example Sentence: "Practitioners of occultism believe in the existence of hidden energies and spiritual realms beyond the physical world."
Synonyms: alchemy; divination; enchantment; esotericism; magic; mysticism
Opposite Meaning: science

omniscient (adjective) /ɒmˈnɪsɪənt/
Definition: Having complete, all-encompassing knowledge or awareness of everything.
Example Sentence: "The prophet's followers believed that he had an omniscient understanding of the future."
Synonyms: almighty; awareness; cognizant; godlike; knowing; omnipotent
Opposite Meaning: uninformed

option (noun) /ˈɒp ʃən/
Definition: A choice or alternative that is available for consideration or selection.
Example Sentence: "He considered the option of relocating to a different city for better job opportunities."
Synonyms: alternative; choice; course; decision; opportunity; possibility
Opposite Meaning: necessity

orbicular (adjective) /ɔːˈbɪkjʊlə/
Definition: Spherical or circular in shape.
Example Sentence: "The beach was adorned with smooth, orbicular stones."
Synonyms: annular; circular; cyclical; discoid; globular; round
Opposite Meaning: square

percolate (verb) /ˈpɜrkəˌleɪt/
Definition: To filter or pass through a porous material, allowing a liquid to gradually penetrate and move through it.
Example Sentence: "Ideas began to percolate in his mind as he read through the inspiring book."
Synonyms: brew; drain; drip; exude; filtrate; flow
Opposite Meaning: block

postponement (noun) /poʊstˈpoʊn mənt/
Definition: The act of delaying or rescheduling an event, activity, or obligation to a later time or date.
Example Sentence: "The postponement of the concert disappointed many fans who had been eagerly anticipating the event."
Synonyms: adjournment; deferment; deferral; delay; extension; hiatus
Opposite Meaning: advancement

probe (verb) /proʊb/
Definition: To investigate, explore, or examine something thoroughly and systematically, often with the intention of obtaining information or understanding a particular subject or situation.
Example Sentence: "The survey aimed to probe public opinion on the controversial topic."
Synonyms: analyze; delve; examine; explore; inquire; inspect
Opposite Meaning: ignore

prohibition (noun) /ˌprəʊ(h)ɪˈbɪʃn/
Definition: The act of forbidding or prohibiting something, typically by law.
Example Sentence: "The restaurant had to abide by the prohibition on serving alcohol to minors."
Synonyms: banning; boycott; disallowance; embargo; injunction; interdiction
Opposite Meaning: allowance

propitious (adjective) /prəˈpɪʃəs/
Definition: Favorable, auspicious, or likely to lead to a positive outcome.
Example Sentence: "The team felt that the signs were propitious for a winning season."
Synonyms: auspicious; bright; encouraging; fortunate; heartening; positive
Opposite Meaning: unfavorable

proximity (noun) /prɒkˈsɪm ɪ ti/
Definition: The state or quality of being near or close in space, time, or relationship.
Example Sentence: "The proximity of the airport to the hotel made it an ideal choice for frequent travelers."
Synonyms: accessibility; adjacency; closeness; contiguity; imminence; intimacy
Opposite Meaning: distance

reaction (noun) /riˈækʃən/
Definition: A response or behavior that occurs as a result of a stimulus, event, or situation.
Example Sentence: "The allergic reaction to the medication caused hives and itching."
Synonyms: answer; backlash; comeback; feedback; outcome; reflex
Opposite Meaning: inaction

rejoice (verb) /rɪˈdʒɔɪs/
Definition: To express elation or jubilation in response to a positive event, outcome, or situation.
Example Sentence: "Let's rejoice in the simple pleasures that life brings our way every day."
Synonyms: bask; beam; celebrate; cheer; delight; exult
Opposite Meaning: mourn

renounce (verb) /rɪˈnaʊns/
Definition: To formally give up, reject, or disown something, typically a belief, right, or claim.
Example Sentence: "The monk chose to renounce all worldly possessions and live a simple life."
Synonyms: abandon; abdicate; abjure; abnegate; decline; eschew
Opposite Meaning: claim

resounding (adjective) /rɪˈzaʊndɪŋ/
Definition: Unmistakable or emphatic.
Example Sentence: "The resounding success of the company's new product launch was a game-changer."
Synonyms: booming; decisive; emphatic; notable; outstanding; ringing
Opposite Meaning: faint

saturated (adjective) /ˈsætʃ əˌreɪ tɪd/
Definition: Filled or soaked to its maximum capacity.
Example Sentence: "After the heavy rain, the ground became saturated with water."
Synonyms: brimming; complete; drenched; engorged; filled; full
Opposite Meaning: dry

schooling (noun) /ˈsku lɪŋ/
Definition: The formal process of education and instruction provided within a structured educational system.
Example Sentence: "Her parents prioritized her schooling and ensured she had access to quality education."
Synonyms: academia; curriculum; education; instruction; knowledge; learning
Opposite Meaning: ignorance

sectarian (adjective) /sɛkˈtɛːrɪən/
Definition: Relating to or characteristic of a particular religious, political, or ideological group or sect.
Example Sentence: "The conflict was fueled by sectarian divisions."
Synonyms: adherent; disciple; dissident; doctrinaire; factional; fanatic
Opposite Meaning: unifying

souvenir (noun) /ˌsu vəˈnɪər/
Definition: An item or memento that is kept as a reminder or keepsake of a person, place, event, or experience.
Example Sentence: "I couldn't resist buying a miniature Eiffel Tower as a souvenir of my trip to France."
Synonyms: keepsake; memento; memorabilia; memorandums; memory; relic
Opposite Meaning: discard

speculative (adjective) /ˈspɛk yəˌleɪ tɪv/
Definition: Based on conjecture, theory, or assumptions rather than concrete evidence or facts.
Example Sentence: "The scientist proposed a speculative theory that challenged existing scientific principles."
Synonyms: abstract; conjectural; hypothetical; imagined; notional; postulated
Opposite Meaning: factual

spindle (noun) /ˈspɪndəl/
Definition: A cylindrical rod or pin that rotates around its axis, typically used for spinning fibers into thread or yarn.
Example Sentence: "The toy top had a spindle that was used to wind up the string."
Synonyms: axis; axle; mandrel; pin; pivot; pole
Opposite Meaning: block

tailored (adjective) /ˈteɪ lərd/
Definition: Specifically designed, customized, or modified to fit a particular purpose, individual, or situation.
Example Sentence: "She received a tailored training program to address her specific fitness goals."
Synonyms: adapted; adjusted; bespoke; crafted; customized; fitted
Opposite Meaning: generic

tranquility (noun) /træŋˈkwɪl ɪ ti/
Definition: A state of calmness, serenity, and peace.
Example Sentence: "After a long day at work, she sought tranquility in the peacefulness of her garden."
Synonyms: calmness; composure; contentment; equanimity; harmony; peace
Opposite Meaning: agitation

trickle (verb) /ˈtrɪk əl/
Definition: To seep gradually and continuously in a thin, gentle stream
Example Sentence: "Sweat started to trickle from his brow as he faced the intense heat."
Synonyms: cascade; dribble; drip; drizzle; exude; filter
Opposite Meaning: gush

trinket (noun) /ˈtrɪŋkət/
Definition: A small ornament or decorative item that is often of little value or use.
Example Sentence: "The trinket was a sentimental reminder of her childhood."
Synonyms: bauble; bibelot; collectible; gewgaw; gimcrack; knickknack
Opposite Meaning: treasure

unclear (adjective) /ʌnˈklɪə/
Definition: Not easily understood, vague, or lacking in clarity.
Example Sentence: "His response to the question was unclear, causing further confusion among the audience."
Synonyms: ambiguous; blurry; enigmatic; fuzzy; hazy; indistinct
Opposite Meaning: clear

volatile (adjective) /ˈvɒl ə tl/
Definition: Highly unstable, unpredictable, or subject to rapid and significant changes.
Example Sentence: "She had a volatile temper, often erupting in anger over minor issues."
Synonyms: capricious; changeable; erratic; explosive; fickle; flighty
Opposite Meaning: stable

wacky (adjective) /ˈwæk i/
Definition: Peculiar, eccentric, or offbeat in a playful and unconventional manner.
Example Sentence: "He had a wacky sense of humor, always coming up with absurd and funny one-liners."
Synonyms: absurd; eccentric; kooky; nutty; oddball; offbeat
Opposite Meaning: conventional

worthless (adjective) /ˈwɜrθ lɪs/
Definition: Lacking value, importance, or significance.
Example Sentence: "She couldn't help but feel worthless after receiving constant criticism from her supervisor."
Synonyms: futile; hollow; insignificant; meaningless; negligible; paltry
Opposite Meaning: valuable