| No. | Item | Definition |
|---|---|---|
| 1. | absurd | Ridiculously unreasonable or foolish. |
| 2. | addlebrained | Confused and foolish. |
| 3. | addlepated | Confused or foolish. |
| 4. | airheaded | Silly and lacking serious thought. |
| 5. | asinine | Extremely foolish or silly. |
| 6. | befuddled | Confused and unable to think clearly. |
| 7. | birdbrained | Silly and not very intelligent. |
| 8. | blockheaded | Very slow or foolish. |
| 9. | boneheaded | Stubbornly foolish. |
| 10. | brainless | Having or showing no intelligence. |
| 11. | bullheaded | Stubborn in a foolish way. |
| 12. | childish | Immaturely foolish. |
| 13. | chuckleheaded | Foolish in a silly way. |
| 14. | clueless | Having no understanding. |
| 15. | confused | Unclear or mistaken in thought. |
| 16. | crackpot | Foolishly strange or irrational. |
| 17. | crazy | Wildly foolish or unreasonable. |
| 18. | daft | Silly or foolish. |
| 19. | dense | Slow or difficult to teach. |
| 20. | dim | Slow to understand. |
| 21. | dimwitted | Not intelligent or quick-thinking. |
| 22. | doltish | Stupid in a dull way. |
| 23. | dull-witted | Slow and unintelligent. |
| 24. | dumb | Showing little intelligence or sense. |
| 25. | empty-headed | Foolish and lacking serious thought. |
| 26. | fatheaded | Foolish or conceited. |
| 27. | fatuous | Silly and pointless. |
| 28. | feeble-minded | Seriously lacking intelligence. |
| 29. | flaky | Silly, unreliable, or eccentric. |
| 30. | flighty | Silly and not serious. |
| 31. | foolish | Lacking good sense or judgment. |
| 32. | goofy | Silly or foolish. |
| 33. | gormless | Lacking sense or initiative. |
| 34. | halfwitted | Very lacking in intelligence. |
| 35. | harebrained | Reckless and foolish. |
| 36. | hasty | Done too quickly and unwisely. |
| 37. | idiotic | Extremely foolish or senseless. |
| 38. | ignorant | Lacking knowledge or awareness. |
| 39. | ill-advised | Not sensible or wise. |
| 40. | illogical | Not making logical sense. |
| 41. | imprudent | Not showing care or wisdom. |
| 42. | inane | Silly and empty of meaning. |
| 43. | insane | Extremely foolish or unreasonable. |
| 44. | irrational | Not based on reason. |
| 45. | juvenile | Immature and foolish. |
| 46. | knuckleheaded | Foolish and lacking sense. |
| 47. | kooky | Eccentric and foolish. |
| 48. | lame | Weak, foolish, or unconvincing. |
| 49. | laughable | So foolish it invites laughter. |
| 50. | loony | Foolish or crazy. |
| 51. | ludicrous | So foolish it seems laughable. |
| 52. | lunatic | Wildly foolish or irrational. |
| 53. | lunkheaded | Dull and foolish. |
| 54. | mad | Wildly foolish or irrational. |
| 55. | mindless | Done without thought or sense. |
| 56. | misguided | Based on poor judgment. |
| 57. | mixed-up | Confused or mistaken. |
| 58. | muddleheaded | Confused and foolish. |
| 59. | myopic | Shortsighted in judgment. |
| 60. | nonsensical | Making no sense. |
| 61. | not bright | Not very intelligent. |
| 62. | not sharp | Not quick or intelligent. |
| 63. | not smart | Lacking intelligence or sense. |
| 64. | numbskulled | Very foolish or stupid. |
| 65. | nutty | Silly or irrational. |
| 66. | obtuse | Slow to grasp things. |
| 67. | out to lunch | Not aware or sensible. |
| 68. | pigheaded | Foolishly stubborn. |
| 69. | pinheaded | Foolish or small-minded. |
| 70. | poorly judged | Showing bad judgment. |
| 71. | preposterous | Contrary to reason or sense. |
| 72. | puerile | Childishly silly or trivial. |
| 73. | rash | Acting too hastily and foolishly. |
| 74. | reckless | Foolishly careless of danger. |
| 75. | ridiculous | Absurd or deserving mockery. |
| 76. | risible | Laughably foolish. |
| 77. | scatterbrained | Disorganized and foolishly forgetful. |
| 78. | screwball | Oddly foolish or crazy. |
| 79. | senseless | Having no sense or reason. |
| 80. | silly | Foolish in a light way. |
| 81. | simple-minded | Naive or lacking complexity. |
| 82. | slow | Not quick to understand. |
| 83. | softheaded | Foolishly sentimental or impractical. |
| 84. | thick | Slow to understand. |
| 85. | thickheaded | Slow to understand. |
| 86. | thoughtless | Showing little thought or care. |
| 87. | unconsidered | Not carefully thought through. |
| 88. | unhinged | Irrational or wildly foolish. |
| 89. | unintelligent | Lacking intelligence. |
| 90. | unreasonable | Not guided by good sense. |
| 91. | unthinking | Acting without proper thought. |
| 92. | unwise | Showing poor judgment. |
| 93. | vacuous | Showing lack of thought. |
| 94. | vapid | Dull and lacking intelligence. |
| 95. | wacky | Silly or absurd. |
| 96. | weak-minded | Lacking mental strength or judgment. |
| 97. | witless | Lacking wit or intelligence. |
| 98. | wooden-headed | Dull and slow to understand. |
| 99. | wrongheaded | Based on mistaken judgment. |
| 100. | zany | Comically silly or foolish. |