Online English Vocabulary Flashcards for ACT 14 (American College Testing) Words

adherence (noun) /ædˈhɪər əns/
Definition: The act of following or sticking to a set of rules, guidelines, principles, or beliefs.
Example Sentence: "The patient's rapid recovery was a testament to his strict adherence to the prescribed treatment plan."
Synonyms: allegiance; commitment; compliance; conformity; dedication; devotion
Opposite Meaning: defiance

ad-hoc (adjective) /ˌad ˈhɒk/
Definition: Created or organized for a specific purpose or situation as it arises, without prior planning or a permanent structure.
Example Sentence: "He came up with an ad hoc solution to fix the problem."
Synonyms: ad-lib; extemporaneous; impromptu; improvised; impulsive; makeshift
Opposite Meaning: planned

aeronautical (adjective) /ˌɛər əˈnɔ tɪ kəl/
Definition: Pertainining to or relating to the study, design, development, or operation of aircraft and other flying objects.
Example Sentence: "He joined an aeronautical research organization to contribute to aerospace innovation."
Synonyms: aerial; aerospace; airborne; aircraft; airworthy; avionic
Opposite Meaning: ground-based

airborne (adjective) /ˈɛərˌbɔrn/
Definition: In the air or capable of traveling through the air.
Example Sentence: "The pollen grains became airborne, spreading allergens throughout the park."
Synonyms: aerial; elevated; floating; flying; gliding; hovering
Opposite Meaning: grounded

amass (verb) /əˈmæs/
Definition: To gather, collect, or accumulate a large quantity of something over time.
Example Sentence: "The entrepreneur worked hard to amass a fortune through his successful business ventures."
Synonyms: accrue; accumulate; aggregate; assemble; collect; compile
Opposite Meaning: disperse

amble (verb) /ˈæm bəl/
Definition: To walk or stroll at a gentle pace in a leisurely and relaxed style.
Example Sentence: "The couple decided to amble along the sandy beach, hand in hand."
Synonyms: dawdle; meander; mosey; perambulate; promenade; ramble
Opposite Meaning: rush

auction (noun) /ˈɔk ʃən/
Definition: A public event or process where goods, services, or properties are sold to the highest bidder.
Example Sentence: "The auction house was filled with enthusiastic buyers and sellers."
Synonyms: bazaar; bidding; clearing; dispersal; hammer; liquidation
Opposite Meaning: retention

avert (verb) /əˈvɜrt/
Definition: To prevent or avoid something from happening, especially something negative or dangerous.
Example Sentence: "Wearing a seatbelt can help avert serious injuries in a car accident."
Synonyms: block; deter; forestall; halt; hinder; impede
Opposite Meaning: cause

bias (noun) /ˈbʌɪəs/
Definition: A tendency to prefer or believe in something in a partial way, often influenced by one's own experiences or beliefs.
Example Sentence: "The news report was criticized for its bias towards a particular political party."
Synonyms: bigotry; favoritism; inclination; leaning; partiality; partisanship
Opposite Meaning: neutrality

canopy (noun) /ˈkæn ə pi/
Definition: An overhead covering or structure that provides shade, shelter, or protection from the elements.
Example Sentence: "The dense forest canopy provided shelter for various bird species."
Synonyms: awning; cap; ceiling; covering; hood; roof
Opposite Meaning: expose

charade (noun) /ʃəˈrɑːd/
Definition: An act or behavior that is intended to deceive or mislead others, often by pretending to be something that one is not.
Example Sentence: "The interview was just a charade, with both parties knowing the outcome in advance."
Synonyms: act; deception; façade; fake; farce; pantomime
Opposite Meaning: genuineness

collegial (adjective) /kəˈliːdʒɪəl/
Definition: Characterized by cooperation, respect, and shared responsibility.
Example Sentence: "The collegial environment among researchers in the lab leads to better results."
Synonyms: companionable; comradely; concerted; cordial; genial; gracious
Opposite Meaning: uncooperative

commercial (adjective) /kəˈmɜr ʃəl/
Definition: Pertaining to commerce, trade, or business activities conducted for financial gain.
Example Sentence: "The television network aired a commercial break during the popular TV show."
Synonyms: business; corporate; economic; financial; industrial; market
Opposite Meaning: non-commercial

concurrent (adjective) /kənˈkʌrənt/
Definition: Pertaining to events, actions, or situations that happen simultaneously or at the same time.
Example Sentence: "The concurrent rise in prices and interest rates made it difficult for homebuyers."
Synonyms: coexisting; coincident; coinciding; concerted; concomitant; confluent
Opposite Meaning: successive

contender (noun) /kənˈtɛn dər/
Definition: An individual, team, or entity that actively participates in a competition, contest, or struggle with the goal of achieving victory, success, or recognition.
Example Sentence: "The tennis player is considered a top contender for the championship."
Synonyms: aspirant; candidate; challenger; competitor; contestant; entrant
Opposite Meaning: supporter

contour (noun) /ˈkɒn tʊər/
Definition: The outline or shape of an object, surface, or area.
Example Sentence: "The skier followed the natural contour of the mountain slope as they descended."
Synonyms: boundary; configuration; curve; edge; figure; form
Opposite Meaning: center

crescendo (noun) /krɪˈʃɛndəʊ/
Definition: A gradual increase in volume, intensity, or force of something.
Example Sentence: "The music reached a crescendo as the orchestra played the final movement."
Synonyms: apex; apogee; climax; crest; height; intensification
Opposite Meaning: diminuendo

culmination (noun) /ˌkʌl məˈneɪ ʃən
Definition: The highest point, climax, or final stage of something, typically a process, event, or achievement.
Example Sentence: "The concert reached its culmination with a breathtaking fireworks display."
Synonyms: apex; climax; completion; consummation; crowning; endpoint
Opposite Meaning: beginning

debit (verb) /dɛb ɪt/
Definition: To deduct or subtract an amount from an account or balance, typically in a financial or accounting context.
Example Sentence: "The bank will automatically debit the mortgage payment from your checking account."
Synonyms: abate; charge; decrease; deduct; dock; draw
Opposite Meaning: credit

disembark (verb) /dɪsɛmˈbɑrk/
Definition: To exit or leave a vehicle, particularly a ship, airplane, or other mode of transportation.
Example Sentence: "The flight attendant announced that it was safe to disembark the airplane."
Synonyms: alight; debark; deplane; disembarkation; disengage; dismount
Opposite Meaning: board

disillusionment (noun) /ˌdɪs ɪˈlu ʒən mənt/
Definition: A state of disappointment, loss of faith, or a feeling of being let down when one's expectations, beliefs, or ideals are shattered or proven to be false or unrealistic.
Example Sentence: "He felt a deep sense of disillusionment after discovering the truth about his partner's infidelity."
Synonyms: betrayal; cynicism; disaffection; disappointment; disapproval; discouragement
Opposite Meaning: contentment

disjointed (adjective) /dɪsˈdʒɔɪn tɪd/
Definition: Lacking coherence, consistency, or logical connection.
Example Sentence: "The movie's plot was so disjointed that it was difficult to follow."
Synonyms: chaotic; disconnected; disorderly; disorganized; erratic; fragmented
Opposite Meaning: coherent

dominion (noun) /dəˈmɪnjən/
Definition: The control, authority, or sovereignty exercised by a governing entity or individual over a particular territory, region, or realm.
Example Sentence: "The empire expanded its dominion through conquest and colonization."
Synonyms: authority; command; control; dominance; governance; government
Opposite Meaning: subordination

elation (noun) /ɪˈleɪʃn/
Definition: An intense feeling of happiness, joy, or a sense of triumph and exultation.
Example Sentence: "The team's victory brought a feeling of elation to their fans."
Synonyms: delight; ecstasy; euphoria; exhilaration; exultation; glee
Opposite Meaning: despair

empirical (adjective) /ɛmˈpɪrɪk(ə)l/
Definition: Based on observation, experience, or evidence obtained through direct sensory perception or experimentation rather than relying solely on theory or speculation.
Example Sentence: "The study was based on empirical data collected in the field."
Synonyms: actual; direct; experiential; experimental; factual; observed
Opposite Meaning: theoretical

enhancement (noun) /ɛnˈhæns mənt/
Definition: The act or process of improving or enriching something, typically to make it better or more effective.
Example Sentence: "The addition of a new wing to the museum was an enhancement to its exhibition space."
Synonyms: advancement; amplification; augmentation; boost; elevation; enrichment
Opposite Meaning: decline

ensnare (verb) /ɪnˈsnɛr/
Definition: To catch or trap someone or something in a snare or trap, often in a deceptive or cunning manner.
Example Sentence: "The con artist tried to ensnare the elderly woman with a phone scam."
Synonyms: ambush; beguile; capture; deceive; entrap; hook
Opposite Meaning: release

expenditure (noun) /ɪkˈspɛn dɪ tʃər/
Definition: The act or process of spending money, resources, or effort in order to acquire goods, services, or achieve certain goals.
Example Sentence: "The company's expenditure on marketing increased significantly this year."
Synonyms: consumption; cost; disbursal; disbursement; expense; investment
Opposite Meaning: saving

foolhardy (adjective) /ˈfuːlhɑːdi/
Definition: Reckless, risky, or imprudent behaviour that shows a lack of good judgment or common sense.
Example Sentence: "The driver's foolhardy disregard for traffic rules resulted in a serious accident."
Synonyms: adventurous; bold; brash; careless; daring; hasty
Opposite Meaning: cautious

galore (adverb) /gəˈlɔr/
Definition: Conveying an abundance or plentiful quantity of something.
Example Sentence: "The buffet spread had desserts galore, tempting everyone with an array of cakes, pastries, and treats."
Synonyms: abundantly; amply; bountifully; copiously; extensively; generously
Opposite Meaning: scarce

globule (noun) /ˈglɒb yul/
Definition: A small, round, or spherical liquid or solid particle that is typically suspended or contained within a larger substance or medium.
Example Sentence: "The globules of mercury rolled off the table, scattering in all directions."
Synonyms: ball; bead; blob; bubble; dewdrop; dot
Opposite Meaning: mass

hardwired (adjective) /ˈhɑrdˈwaɪərd/
Definition: Inherently or permanently ingrained, programmed, or instinctive.
Example Sentence: "The desire to protect one's offspring is hardwired into most animal species."
Synonyms: automatic; fixed; ingrained; inherent; innate; instinctive
Opposite Meaning: flexible

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

hysterical (adjective) /hɪˈstɛr ɪ kəl/
Definition: Characterized by extreme and uncontrollable emotions, often including intense fear, anxiety, or excitement.
Example Sentence: "The woman's hysterical outburst during the argument made it impossible for anyone to reason with her."
Synonyms: agitated; delirious; distraught; excitable; frantic; frenzied
Opposite Meaning: calm

identify (verb) /aɪˈdɛn təˌfaɪ/
Definition: To recognize, establish, or determine the identity of someone or something.
Example Sentence: "The witness was able to identify the suspect in a lineup."
Synonyms: ascertain; classify; detect; determine; discover; distinguish
Opposite Meaning: misidentify

ideology (noun) /ˌaɪ diˈɒl ə dʒi/
Definition: A comprehensive set of ideas, beliefs, or principles that form the basis of a particular political, social, or economic system.
Example Sentence: "The ideology of capitalism promotes free markets and private ownership of resources."
Synonyms: belief; creed; doctrine; dogma; mindset; perspective
Opposite Meaning: apathy

immature (adjective) /ˈɪm əˈtʃʊər/
Definition: Characterized by a lack of emotional, intellectual, or social development, typically associated with younger individuals or those who have not fully matured.
Example Sentence: "The student's immature writing style indicated a need for further development in their language skills."
Synonyms: adolescent; callow; childish; inexperienced; infantile; juvenile
Opposite Meaning: mature

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

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

indifference (noun) /ɪnˈdɪf ər əns/
Definition: The lack of interest, concern, or emotion towards something or someone.
Example Sentence: "He shrugged with indifference when asked about his future plans."
Synonyms: aloofness; apatheticness; apathy; coolness; detachment; disinterest
Opposite Meaning: interest

individuality (noun) /ˌɪn dəˌvɪdʒ uˈæl ɪ ti/
Definition: The unique and distinctive qualities, characteristics, and traits that distinguish one person from others.
Example Sentence: "The school encouraged students to embrace their individuality and pursue their passions."
Synonyms: autonomy; character; distinctiveness; diversity; identity; independence
Opposite Meaning: conformity

induce (verb) /ɪnˈdjuːs/
Definition: To bring about or cause a particular effect, state, or condition deliberately.
Example Sentence: "The hypnotist managed to induce a state of deep relaxation in his subject."
Synonyms: activate; catalyze; compel; elicit; encourage; evoke
Opposite Meaning: deter

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

integrate (verb) /ˈɪn tɪˌgreɪt/
Definition: To combine or merge different parts or elements into a unified whole.
Example Sentence: "The company decided to integrate its marketing and sales departments to enhance efficiency."
Synonyms: amalgamate; assimilate; blend; combine; converge; fuse
Opposite Meaning: separate

limerick (noun) /ˈlɪm ər ɪk/
Definition: A form of poetry known for its distinctive structure and humorous content.
Example Sentence: "The comedian delighted the audience with a hilarious limerick about a mischievous cat."
Synonyms: ballad; composition; couplet; ditty; doggerel; jingle
Opposite Meaning: prose

majestic (adjective) /məˈdʒɛs tɪk/
Definition: Possessing grandeur, dignity, and awe-inspiring beauty.
Example Sentence: "The majestic sunset painted the sky with hues of gold and pink."
Synonyms: grand; impressive; lofty; magnificent; noble; regal
Opposite Meaning: plain

malpractice (noun) /mælˈpræk tɪs/
Definition: The improper or negligent conduct of a professional, typically within a field such as medicine, law, or finance, where they breach the accepted standards of practice.
Example Sentence: "The nurse's malpractice in administering the wrong medication caused severe allergic reactions."
Synonyms: breach; error; fault; incompetence; misbehavior; misconduct
Opposite Meaning: proficiency

manhandle (verb) /ˈmænˌhæn dl/
Definition: To handle or move a person or an object roughly, forcibly, or without proper care.
Example Sentence: "The police had to manhandle the protester to get him into the squad car."
Synonyms: abuse; bully; jostle; maltreat; manacled; mishandle
Opposite Meaning: coddle

marquee (noun) /mɑrˈki/
Definition: A large tent or canopy-like structure, often made of canvas or other durable materials, that is used for outdoor events, gatherings, or performances.
Example Sentence: "The wedding reception was held under a beautifully decorated marquee in the garden."
Synonyms: awning; booth; canopy; cover; gazebo; kiosk
Opposite Meaning: building

mercy (noun) /ˈmɜrsi/
Definition: An act of forgiveness or compassion shown towards someone who is in a vulnerable or disadvantaged position.
Example Sentence: "She had no mercy for the thief who stole from her."
Synonyms: benevolence; charity; clemency; empathy; forbearance; kindness
Opposite Meaning: cruelty

misdemeanor (noun) /ˌmɪs dɪˈmi nər/
Definition: A type of criminal offense that is considered less serious than a felony but still constitutes a violation of the law.
Example Sentence: "The police officer issued a citation for the misdemeanor of public intoxication."
Synonyms: breach; fault; infraction; infringement; lapse; misconduct
Opposite Meaning: felony

mockery (noun) /ˈmɒk ə ri/
Definition: The act, behavior, or expression of making fun of or ridiculing someone or something.
Example Sentence: "The political cartoon was a scathing mockery of the government's actions."
Synonyms: belittlement; contempt; derision; jeering; parody; ridicule
Opposite Meaning: respect

motion (noun) /ˈmoʊ ʃən/
Definition: The act or process of moving or changing position, typically involving a physical entity.
Example Sentence: "The ocean waves crashed against the shore in a rhythmic motion."
Synonyms: action; activity; animation; flow; gesture; locomotion
Opposite Meaning: stillness

mutiny (noun) /ˈmjuːtɪni/
Definition: A rebellion or insurrection against a lawful authority, typically within a military or naval organization.
Example Sentence: "The mutiny on the prison ship was quickly quelled by the guards."
Synonyms: coup; insurgency; resistance; revolt; revolution; treachery
Opposite Meaning: loyalty

nipper (noun) /ˈnɪp ər/
Definition: A child or a young person, especially one who is active or mischievous.
Example Sentence: "The park was filled with little nippers running around and playing."
Synonyms: babe; child; kid; munchkin; tike; toddler
Opposite Meaning: adult

nutrient (noun) /ˈnu tri ənt/
Definition: A substance or compound that is essential for the growth, development, and maintenance of living organisms.
Example Sentence: "Protein is an important nutrient for muscle growth and repair."
Synonyms: aliment; fodder; foodstuff; fuel; mineral; nourisher
Opposite Meaning: toxin

philosophy (noun) /fɪˈlɒs ə fi/
Definition: The study of fundamental questions about existence, knowledge, values, reason, and the nature of reality.
Example Sentence: "Philosophy encourages us to engage in reasoned discourse and open-minded inquiry."
Synonyms: doctrine; epistemology; ethics; ideology; logic; metaphysics
Opposite Meaning: ignorance

piecemeal (adverb) /ˈpiːsmiːl/
Definition: Done or happening in a gradual or incremental manner, involving the completion of individual parts or tasks one at a time, rather than all at once.
Example Sentence: "The employee's workload was assigned piecemeal, with tasks given out as they arose."
Synonyms: fragmented; incremental; intermittent; interrupted; partially; phased
Opposite Meaning: whole

pounce (verb) /paʊns/
Definition: To seize or attack prey or a target with great speed and determination.
Example Sentence: "The spider will pounce on any insect that comes near its web."
Synonyms: ambush; assault; attack; dart; dive; grab
Opposite Meaning: retreat

prance (verb) /prɑːns/
Definition: To move in a lively, energetic and often playful manner, often with exaggerated steps and movements.
Example Sentence: "The peacock spread its feathers and began to prance in a display of beauty."
Synonyms: bound; caper; cavort; dance; frisk; gambol
Opposite Meaning: plod

predecessor (noun) /ˈpriːdɪsɛsə/
Definition: A person or thing that comes before another in time or in a sequence of events.
Example Sentence: "The actor struggled to fill the shoes of his famous predecessor."
Synonyms: ancestor; antecedent; antecessor; forebear; forefather; foregoer
Opposite Meaning: successor

predicament (noun) /prɪˈdɪkəm(ə)nt/
Definition: A difficult or unfortunate situation, often one that is caused by a complex set of circumstances and from which there is no easy or obvious way out.
Example Sentence: "She was in a difficult predicament when her passport got stolen abroad."
Synonyms: bind; crisis; dilemma; emergency; hardship; imbroglio
Opposite Meaning: advantage

queasy (adjective) /ˈkwiːzi/
Definition: Discomfort or unease in the stomach or abdomen, which can be accompanied by a sensation of nausea or dizziness.
Example Sentence: "The turbulence on the plane made him feel queasy."
Synonyms: bilious; faint; giddy; groggy; ill; nauseous
Opposite Meaning: comfortable

reluctant (adjective) /rɪˈlʌk tənt/
Definition: Unwillingness or hesitation to act or comply with a particular request, task, or situation.
Example Sentence: "The student was reluctant to ask questions in class for fear of appearing foolish."
Synonyms: averse; coy; disinclined; hesitant; loath; resistant
Opposite Meaning: eager

reserved (adjective) /rɪˈzɜrvd/
Definition: Tending to be cautious, restrained, or introverted in speech, or demeanor.
Example Sentence: "The shy and reserved student surprised everyone with her exceptional presentation skills."
Synonyms: aloof; composed; controlled; discreet; introverted; quiet
Opposite Meaning: outgoing

revitalizing (adjective) /riˈvaɪt lˌaɪz/
Definition: Rejuvenating, renewing, or invigorating a person, place, organization, or system.
Example Sentence: "After a long day at work, a revitalizing walk in nature helped me relax and recharge."
Synonyms: energizing; enlivening; invigorating; reenergizing; refreshing; regenerating
Opposite Meaning: exhausting

shrivel (verb) /ˈʃrɪv əl/
Definition: To wilt, dry, or wither due to loss of moisture or vitality.
Example Sentence: "The flowers began to shrivel in the scorching heat of the summer."
Synonyms: contract; decay; decline; desiccate; droop; dry
Opposite Meaning: bloom

stern (adjective) /stɜrn/
Definition: Displaying seriousness, strictness, or firmness.
Example Sentence: "His stern gaze made it clear that he was not to be taken lightly."
Synonyms: austere; authoritative; firm; harsh; inflexible; resolute
Opposite Meaning: lenient

stimulating (adjective) /ˈstɪmjʊˌleɪtɪŋ/
Definition: Captivating, engaging, or intellectually invigorating.
Example Sentence: "The stimulating debate among the panelists sparked a lively discussion."
Synonyms: arousing; captivating; electrifying; engaging; enthralling; exciting
Opposite Meaning: boring

superstitious (adjective) /ˌsuːpəˈstɪʃəs/
Definition: Believing in things that are not based on reason or scientific evidence, such as supernatural powers or luck.
Example Sentence: "She was superstitious and always carried a rabbit's foot for luck."
Synonyms: credulous; fearful; groundless; gullible; irrational; mythical
Opposite Meaning: rational

thereafter (adverb) /ˌðɛərˈæf tər/
Definition: Denoting a time or event subsequent to a particular point in time.
Example Sentence: "She attended the conference, and thereafter felt inspired to change her career path."
Synonyms: afterward; afterwards; consequently; following; later; next
Opposite Meaning: beforehand

toxic (adjective) /ˈtɒk sɪk/
Definition: Harmful, poisonous, or detrimental to living organisms, well-being, or the environment.
Example Sentence: "He finally decided to end the toxic relationship for the sake of his mental well-being."
Synonyms: caustic; damaging; deleterious; harmful; hazardous; lethal
Opposite Meaning: harmless

triumphant (adjective) /traɪˈʌm fənt/
Definition: Great victory, success, or achievement.
Example Sentence: "The triumphant athlete raised their arms in victory as they crossed the finish line."
Synonyms: accomplished; celebratory; conquering; elated; exultant; glorious
Opposite Meaning: defeated

undirected (adjective) /ˌʌn dɪˈrɛk tɪd/
Definition: Lacking a specific aim, purpose, or guidance.
Example Sentence: "The team's efforts seemed undirected and lacked a clear focus."
Synonyms: aimless; arbitrary; chaotic; disorganized; erratic; haphazard
Opposite Meaning: guided

vile (adjective) /vaɪl/
Definition: Extremely unpleasant, offensive, or morally repulsive.
Example Sentence: "The abusive boss had a vile temper, making the workplace a hostile environment."
Synonyms: abhorrent; contemptible; despicable; detestable; disgusting; execrable
Opposite Meaning: pleasant