| No. | Term | Definition |
|---|---|---|
| 1. | Absurd | ridiculously unreasonable |
| 2. | Airheaded | lacking sense or judgment |
| 3. | Asinine | extremely foolish |
| 4. | Barmy | mad; foolish |
| 5. | Batty | eccentric; slightly crazy |
| 6. | Bemused | confused; bewildered |
| 7. | Birdbrained | stupid; scatterbrained |
| 8. | Bizarre | very strange |
| 9. | Bonkers | crazy; irrational |
| 10. | Brainless | showing no intelligence |
| 11. | Careless | not giving enough attention |
| 12. | Childish | immature; not adultlike |
| 13. | Clueless | having no understanding |
| 14. | Cockamamie | absurdly implausible |
| 15. | Daffy | eccentric; foolish |
| 16. | Daft | foolish; silly-minded |
| 17. | Dippy | foolish; slightly crazy |
| 18. | Dopey | stupid; slow-witted |
| 19. | Dotty | eccentric; slightly mad |
| 20. | Dull-witted | slow to understand |
| 21. | Eccentric | oddly unconventional |
| 22. | Empty-headed | lacking intelligence |
| 23. | Erratic | unpredictable; inconsistent |
| 24. | Fatuous | silly and pointless |
| 25. | Featherbrained | frivolous; unintelligent |
| 26. | Fickle | changing mind too often |
| 27. | Flaky | unreliable; scatterbrained |
| 28. | Flighty | impulsive; not serious |
| 29. | Foolhardy | recklessly bold |
| 30. | Foolish | lacking good sense |
| 31. | Giddy | silly with excitement |
| 32. | Goofy | comically foolish |
| 33. | Gormless | lacking initiative or sense |
| 34. | Half-baked | poorly thought out |
| 35. | Haphazard | lacking order or planning |
| 36. | Harebrained | wildly foolish or rash |
| 37. | Hasty | done too quickly |
| 38. | Heedless | careless; thoughtless |
| 39. | Idiotic | very stupid |
| 40. | Ignorant | lacking knowledge |
| 41. | Ill-advised | not wise or prudent |
| 42. | Imprudent | not showing good judgment |
| 43. | Inane | lacking meaning or sense |
| 44. | Inattentive | not paying attention |
| 45. | Injudicious | showing poor judgment |
| 46. | Irresponsible | not dependable; careless |
| 47. | Jocular | fond of joking |
| 48. | Jokey | not serious; playful |
| 49. | Jumpy | nervously reactive |
| 50. | Juvenile | immature; childish |
| 51. | Kooky | oddly eccentric |
| 52. | Loony | crazy; foolish |
| 53. | Ludicrous | laughably absurd |
| 54. | Madcap | wildly impulsive |
| 55. | Mindless | done without thought |
| 56. | Misguided | based on wrong ideas |
| 57. | Moronic | very foolish or stupid |
| 58. | Naive | innocently inexperienced |
| 59. | Nonsensical | making no sense |
| 60. | Nutty | crazy or foolish |
| 61. | Oblivious | unaware; inattentive |
| 62. | Oddball | unconventional person |
| 63. | Offbeat | unusual; quirky |
| 64. | Outlandish | strangely exaggerated |
| 65. | Preposterous | utterly unreasonable |
| 66. | Puerile | childishly silly |
| 67. | Quaint | charmingly old-fashioned |
| 68. | Quirky | pleasantly unusual |
| 69. | Reckless | careless of consequences |
| 70. | Ridiculous | deserving laughter or scorn |
| 71. | Risky | involving danger or loss |
| 72. | Scatterbrained | disorganized; forgetful |
| 73. | Screwball | eccentric; unpredictable |
| 74. | Shallow | lacking depth or seriousness |
| 75. | Shoddy | poorly made or done |
| 76. | Simpleminded | lacking sophistication or sense |
| 77. | Slapstick | broad physical comedy |
| 78. | Sloppy | careless; messy |
| 79. | Softheaded | not very intelligent |
| 80. | Spaced-out | distracted; unfocused |
| 81. | Spur-of-the-moment | done without planning |
| 82. | Thoughtless | showing little consideration |
| 83. | Trifling | unimportant; petty |
| 84. | Trivial | of little importance |
| 85. | Unbalanced | mentally unstable |
| 86. | Unwise | not sensible or prudent |
| 87. | Vacant | showing no thought |
| 88. | Vapid | dull; lacking interest |
| 89. | Wacky | amusingly strange |
| 90. | Wayward | difficult to control |
| 91. | Whimsical | playfully fanciful |
| 92. | Witless | lacking intelligence |
| 93. | Wrongheaded | stubbornly mistaken |
| 94. | Zany | comically eccentric |
| 95. | Zesty | lively; spirited |
| 96. | Zigzag | erratic; not straight |
| 97. | Zilch-minded | having no sense |
| 98. | Zonked | stunned; out of it |