129 entries under foolish topic. ×

1
immature(silly, rash, absurd, risky)
1
imprudent(weak, simple, silly, thoughtless)
1
incautious(weak, simple, silly, thoughtless)
1
inconsistent(adjective, simple, silly, stupid)
1
indiscreet(adjective, dull, weak, simple, silly)
1
irresponsible(stupid, rash, risky, dumb)
1
kooky(weak, simple, silly, thoughtless)
1
loony(weak, simple, silly, thoughtless)
1
lunatic(weak, simple, silly, crazy)
1
mentally deficient(expression, adjective, silly, stupid)
1
mentally handicapped(expression, adjective, silly, stupid)
1
nerdy(weak, simple, silly, thoughtless)
1
nitwitted(adjective, simple, silly, stupid)
1
not intelligent(expression, adjective, silly, stupid)
1
preposterous(weak, simple, silly, thoughtless)
1
rash(adjective, dull, simple, slow, careless)
1
scatterbrained(adjective, simple, slow, stupid)
1
short-sighted(weak, simple, silly, thoughtless)
1
tomfool
1
trivial(adjective, dull, simple, slight, slow)
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APASmart Define. (2016). unintelligent thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/unintelligent/thesaurus/synonyms
ChicagoSmart Define. 2016. "unintelligent thesaurus" https://smartdefine.org/unintelligent/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2016, unintelligent thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/unintelligent/thesaurus/synonyms>.
MLASmart Define. "unintelligent thesaurus" 24 March 2016. Web. 28 September 2026. <https://smartdefine.org/unintelligent/thesaurus/synonyms>