151 entries under foolish topic. ×

5
idiotic(adjective, weak, simple, knowledge, ability)
5
inane(adjective, careless, silly, stupid)
5
reckless(adjective, careless, wild, silly)
5
tomfool(adjective, knowledge, ability)
5
wild(adjective, careless, fantastic, thoughtless)
5
witless(adjective, weak, simple, silly)
4
cockeyed(adjective, knowledge, ability, informal, extraordinary)
4
half-baked(adjective, weak, simple, stupid)
4
nutty(adjective, weak, simple, wild, silly)
4
ridiculous(adjective, weak, simple, wild, strange)
4
wacky(adjective, weak, simple, knowledge, slang)
3
birdbrained(adjective, slang, ability, crazy)
3
brainless(adjective, weak, simple, careless, silly)
3
careless(adjective, wrong, wild, stupid)
3
daffy(adjective, weak, simple, silly)
3
daft(adjective, weak, simple, wild, silly)
3
fatuous(weak, simple, silly, stupid)
3
half-witted(weak, simple, silly, thoughtless)
3
imprudent(adjective, weak, simple, careless, wild)
3
incautious(adjective, weak, simple, careless, wild)
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APASmart Define. (2015). harebrained thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/harebrained/thesaurus/synonyms
ChicagoSmart Define. 2015. "harebrained thesaurus" https://smartdefine.org/harebrained/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, harebrained thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/harebrained/thesaurus/synonyms>.
MLASmart Define. "harebrained thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/harebrained/thesaurus/synonyms>