151 entries under foolish topic. ×

2
potty(adjective, wild, silly, stupid)
2
puerile(silly, stupid, fantastic, trivial)
2
screwball(silly, unwise)
2
unbalanced(silly, unreliable, changeable, unwise)
2
unreasonable(weak, simple, silly, stupid)
2
unwise(weak, simple, silly, stupid)
1
barmy(adjective, careless, silly, stupid)
1
batty(adjective, keen, warm, slow, wild)
1
beyond all reason(expression, idiom, silly, fantastic)
1
bizarre(adjective, careless, silly, stupid)
1
changeable(adjective, careless, wild, excited)
1
cockamamy(silly, thoughtless, unwise, unintelligent)
1
cracked(adjective, wild, silly, stupid)
1
delirious(silly, unwise)
1
deranged(adjective, wild, silly, stupid)
1
derisory(silly, fantastic, unwise, half-baked)
1
devil-may-care(adjective, careless, wild, immoral)
1
doltish(weak, simple, silly, thoughtless)
1
dumb(crazy, impulsive, insane, unintelligent)
1
eccentric(adjective, keen, warm, wild, strange)
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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>