100 Antonyms:
1. Abstract - Concrete
2. Abundant - Scarce
3. Accept - Refuse
4. Accurate - Inaccurate
5. Active - Passive
6. Acute - Chronic
7. Admire - Despise
8. Advance - Retreat
9. Agree - Disagree
10. Aggressive - Passive
11. Ancient - Modern
12. Angry - Calm
13. Artificial - Natural
14. Awake - Asleep
15. Awkward - Graceful
16. Bad - Good
17. Beautiful - Ugly
18. Begin - End
19. Believe - Disbelieve
20. Below - Above
21. Beneficial - Harmful
22. Bitter - Sweet
23. Black - White
24. Brave - Cowardly
25. Bright - Dim
26. Broad - Narrow
27. Calm - Agitated
28. Chaos - Order
29. Cheap - Expensive
30. Clean - Dirty
31. Close - Open
32. Cold - Hot
33. Comfort - Discomfort
34. Complex - Simple
35. Conceal - Reveal
36. Confident - Doubtful
37. Confused - Clear
38. Constant - Variable
39. Courageous - Fearful
40. Cruel - Kind
41. Dark - Light
42. Dead - Alive
43. Decrease - Increase
44. Defeat - Victory
45. Definite - Indefinite
46. Delayed - Prompt
47. Demolish - Build
48. Dense - Sparse
49. Depart - Arrive
50. Destructive - Constructive
51. Difficult - Easy
52. Disagree - Agree
53. Dislike - Like
54. Disorder - Order
55. Distant - Near
56. Doubt - Belief
57. Down - Up
58. Dry - Wet
59. Early - Late
60. Empty - Full
61. Enemy - Friend
62. End - Begin
63. Enormous - Tiny
64. Enter - Exit
65. Equal - Unequal
66. Evil - Good
67. Expensive - Cheap
68. Exterior - Interior
69. External - Internal
70. Fail - Succeed
71. False - True
72. Famous - Unknown
73. Fast - Slow
74. Fear - Courage
75. Feminine - Masculine
76. Few - Many
77. Flexible - Rigid
78. Foolish - Wise
79. Forward - Backward
80. Fragile - Strong
81. Free - Captive
82. Fresh - Stale
83. Friendly - Unfriendly
84. Funny - Serious
85. Generous - Stingy
86. Gentle - Rough
87. Giant - Tiny
88. Give - Take
89. Glad - Sad
90. Good - Bad
91. Happy - Sad
92. Hard - Soft
93. Hate - Love
94. Heavy - Light
95. Honest - Dishonest
96. Hopeful - Desperate
97. Hot - Cold
98. Humble - Arrogant
99. Ignorant - Knowledgeable
100. Important - Unimportant