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You are here: Home / Vocabulary / 100 Must-Know Words for ACT English Section

100 Must-Know Words for ACT English Section

February 24, 2026

100 Must-Know Words for ACT English Section

No. Term Definition
1. Abate Become less intense.
2. Aberration Departure from what is normal.
3. Abridge Shorten without losing meaning.
4. Abstain Choose not to do something.
5. Acclaim Praise publicly and enthusiastically.
6. Accolade Award or expression of praise.
7. Acrimony Bitterness in speech or manner.
8. Admonish Warn or scold firmly.
9. Adverse Harmful; unfavorable.
10. Aesthetic Relating to beauty or art.
11. Affable Friendly; easy to talk to.
12. Alleviate Make less severe.
13. Ambiguous Open to more than one meaning.
14. Amiable Pleasant and friendly.
15. Amicable Friendly; not hostile.
16. Amplify Increase in size or effect.
17. Analogous Comparable in certain respects.
18. Anomaly Something that deviates from standard.
19. Antagonize Cause someone to become hostile.
20. Apathy Lack of interest or concern.
21. Appease Calm or satisfy demands.
22. Appraise Assess value or quality.
23. Arduous Difficult; requiring much effort.
24. Articulate Express clearly and effectively.
25. Assert State confidently as fact.
26. Assiduous Hardworking; persistent.
27. Austere Severely simple; strict.
28. Avarice Extreme greed for wealth.
29. Banal Commonplace; lacking originality.
30. Beguile Charm or deceive pleasantly.
31. Benevolent Kind; well-meaning.
32. Benign Harmless; gentle.
33. Bolster Support; strengthen.
34. Brevity Shortness of expression.
35. Cacophony Harsh, discordant sound.
36. Candid Truthful and straightforward.
37. Capricious Impulsive; unpredictable.
38. Catalyst Something that speeds change.
39. Censure Express strong disapproval.
40. Cite Quote as evidence.
41. Clarity Clearness; ease of understanding.
42. Coerce Force by threats or pressure.
43. Cogent Clear, logical, and convincing.
44. Collaborate Work together toward a goal.
45. Concise Brief yet comprehensive.
46. Concur Agree; share an opinion.
47. Condone Accept as permissible.
48. Conspicuous Easily seen; noticeable.
49. Contend Argue; maintain a position.
50. Contradict Assert the opposite.
51. Convey Communicate; make known.
52. Corroborate Confirm with supporting evidence.
53. Credible Believable; trustworthy.
54. Cursory Quick and not thorough.
55. Deference Respectful submission to others.
56. Deficit Shortfall; amount lacking.
57. Deft Skillful and quick.
58. Delineate Describe precisely; outline.
59. Denote Indicate; be a sign of.
60. Depict Represent in words or images.
61. Deride Mock; ridicule.
62. Deter Discourage from acting.
63. Diligent Careful and persistent in effort.
64. Disparage Speak of as unimportant.
65. Diverge Move in different directions.
66. Eloquent Fluent, persuasive speaking or writing.
67. Elusive Hard to find or grasp.
68. Emulate Imitate to equal or excel.
69. Endorse Support publicly; approve.
70. Engender Cause to develop.
71. Enhance Improve; increase value.
72. Enigma Mystery; puzzling thing.
73. Epitome Perfect example of something.
74. Equivocal Unclear; having two meanings.
75. Eradicate Destroy completely.
76. Erratic Unpredictable; inconsistent.
77. Evoke Bring to mind; elicit.
78. Exacerbate Make a problem worse.
79. Exemplify Illustrate by example.
80. Exonerate Clear from blame.
81. Explicit Stated clearly and directly.
82. Fathom Understand after much thought.
83. Feasible Possible; workable.
84. Fidelity Faithfulness; accuracy to original.
85. Flourish Grow vigorously; thrive.
86. Foment Stir up trouble or unrest.
87. Frugal Careful with money; thrifty.
88. Garrulous Excessively talkative.
89. Gregarious Sociable; enjoying groups.
90. Hasty Done too quickly; rash.
91. Hinder Create obstacles; impede.
92. Hypothesis Proposed explanation to test.
93. Impartial Fair; not biased.
94. Impeccable Flawless; without errors.
95. Imperative Necessary; of vital importance.
96. Impetuous Acting suddenly without thought.
97. Inadvertent Unintentional; accidental.
98. Incessant Continuing without stopping.
99. Incisive Sharp and clear in thought.
100. Inevitable Certain to happen.
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