1. twaddle
2. simper
3. frivolous
4. goose
5. foolish
6. fool
7. goofy
8. inane
9. ridiculous
10. zany
11. sappy
12. dizzy
13. empty-headed
14. gaga
15. giddy
16. sillily
17. silliness
18. slaphappy
19. airheaded
20. birdbrained
21. cockamamie
22. cockamamy
23. featherbrained
24. light-headed
25. pathetic
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26. punch-drunk
27. sillier
28. silliest
29. unreasonable
30. wacky
31. anserine
32. fatuous
33. inept
34. asinine
35. nincompoop
36. puerile
37. apish
38. cackle
39. calf
40. daft
41. desipient
42. dingbat
43. drivel
44. flibbertigibbet
45. fond
46. foolery
47. footling
48. idle
49. imbecile
50. light
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51. pinheaded
52. sheep
53. simpleton
54. soppy
55. stupid
56. alcatote
57. alec
58. amelioration
59. anserous
60. baloney
61. banter
62. batrachomyomachia
63. bilge
64. bilgewater
65. blah
66. blatherskite
67. boloney
68. boob
69. bosh
70. brainless
71. buffoon
72. chaff
73. charlie
74. cuckoo
75. dimwit
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76. dippy
77. ditsy
78. ditsy or ditzy
79. dopey
80. doting
81. dotterel
82. drool
83. exsufflicate
84. fadaise
85. fop
86. giggles
87. git
88. glaikit
89. goff
90. goof
91. gooseberry
92. goosy
93. gubbins
94. half-witted
95. heehaw
96. humbug
97. inanely
98. jane-of-apes
99. jolly
100. josh
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