32 entries under foolish topic. ×

11
fatuous(adjective, silly, stupid, crazy)
5
silly(adjective, ability, stupid, crazy)
4
harebrained(adjective, ability, crazy, vague)
4
witless(adjective, silly, innocent, vague)
3
half-baked(adjective, stupid, impulsive, unintelligent)
2
brainless(silly, impulsive, impractical, unintelligent)
2
dull(simple, silly, stupid, crazy)
2
dumb(stupid, crazy, insane, unintelligent)
2
idiotic(adjective, silly, stupid, crazy)
2
imbecilic(adjective, crazy, innocent, vague)
2
mindless(adjective, silly, innocent, dense)
2
moronic(adjective, dull, simple, slow, silly)
2
senseless(crazy, impulsive, insane, unintelligent)
2
thick-witted(crazy, insane)
2
unintelligent(silly, stupid, crazy, insane)
1
absurd(silly, impractical, unintelligent, unaware)
1
asinine(silly, crazy, insane, unintelligent)
1
batty(crazy, impulsive, insane, impractical)
1
crazy(impulsive, insane, impractical, unintelligent)
1
imbecile(dull, simple, silly, crazy)
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APASmart Define. (2015). birdbrained thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/birdbrained/thesaurus/synonyms
ChicagoSmart Define. 2015. "birdbrained thesaurus" https://smartdefine.org/birdbrained/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, birdbrained thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/birdbrained/thesaurus/synonyms>.
MLASmart Define. "birdbrained thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/birdbrained/thesaurus/synonyms>