• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar
Home of English Grammar
  • Home
  • Course
  • Exercises
  • Grammar Rules
  • Matches
  • Posts
  • Tools
    • Grammar Checker
    • Very Replacer
    • Word Counter
  • Vocabulary Lists
  • Archives
    • Social Media Posts
    • Writing Guides
  • Join free

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.

Improve your English grammar, vocabulary and writing

We take you step by step from beginner to advanced, even if you struggled with English at school or have always had trouble remembering the rules.

  • 10 modules, 112 lessons and 730 questions
  • Just log in and learn anytime and anywhere
  • Your progress is saved in your account
  • Download the 2027 Grammar Guide (PDF)
Join free

Already have an account? Sign in

See what’s in the course

Primary Sidebar

2.4M761.4K165.8K

Free 2027 Grammar Guide

  • Download Grammar Guide (PDF)
  • Online grammar course, A1 to C2
  • Weekly exercises and vocabulary
  • Join over 3 million English learners

We respect your privacy. Unsubscribe anytime.

Already have an account? Sign in

Grammar Checker - Try Now

Latest Posts

  • 100 Best Synonyms for “Propositive” October 23, 2026
  • 100 Best Synonyms for “Emphasizing” October 23, 2026
  • 100 Best Synonyms for “Communicative” October 23, 2026
  • Icky vs. gross vs. nasty vs. disgusting vs. revolting vs. vile October 23, 2026
  • Comparatives Exercise October 23, 2026
  • 100 Best Synonyms for “Proposition” October 23, 2026
  • 100 Best Synonyms for “Stagnation” October 23, 2026
  • 100 Best Synonyms for “Dumb” October 23, 2026
  • The origin and meaning of “off the cuff” October 23, 2026
  • 100 Phrases for Declining Requests at Work Politely October 23, 2026
Home of English Grammar

Free English grammar exercises, rules and vocabulary lists, with new exercises every week. Join the leading English grammar site with over 3 million followers.

Join free

Learn

  • Exercises
  • Matches
  • Grammar rules
  • Vocabulary lists
  • Writing guides
  • Online tools

More

  • Top social media posts
  • Various posts
  • Contact

Account

  • Join free
  • Grammar Course
  • Free grammar guide (PDF)

Copyright © 2026 EnglishGrammar.org

  • Disclaimer
  • Privacy policy
  • Terms
  • Sitemap