11
foolish
8
dumb
8
silly
8
insane
6
idiotic
6
crazy
6
slow(adjective, dull)
5
dull
5
stupid(adjective, dull)
5
mad
4
simple
3
asinine
3
fatuous
3
unintelligent(adjective, dull)
3
obtuse
1
numskull
1
newt
0
brainless
0
goofy
0
irrational
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APASmart Define. (2015). sage thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/sage/thesaurus/antonyms
ChicagoSmart Define. 2015. "sage thesaurus" https://smartdefine.org/sage/thesaurus/antonyms (accessed September 24, 2026).
HarvardSmart Define 2015, sage thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/sage/thesaurus/antonyms>.
MLASmart Define. "sage thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/sage/thesaurus/antonyms>