6
useless(adjective, offensive, rude, stupid, vulgar)
6
weak-minded(adjective, ability, planned)
5
antic
5
barmy(adjective, careless, silly, stupid, trivial)
5
careless(adjective, wrong, wild, silly, stupid)
5
cockeyed(adjective, knowledge, ability, informal, silly)
5
crackpot(adjective, impractical, half-baked, doomed)
5
dense(adjective, dull, simple, slow, silly)
5
eccentric(adjective, wild, strange, silly, crazy)
5
erratic(adjective, wrong, wild, strange, silly)
5
feebleminded(adjective, weak, simple, silly, stupid)
5
gooselike
5
goosey
5
ill-judged(adjective, careless, silly, thoughtless, rash)
5
incongruous(adjective, silly, stupid, insignificant, unreasonable)
5
inconsistent(adjective, simple, wrong, silly, stupid)
5
light-headed(adjective, silly, faint)
5
pointless(adjective, dull, simple, slow, silly)
5
simple-minded(adjective, silly, stupid, green, fat)
5
slight
10 years ago|43k views|share |citing 
APASmart Define. (2016). foolish thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/foolish/thesaurus/synonyms
ChicagoSmart Define. 2016. "foolish thesaurus" https://smartdefine.org/foolish/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2016, foolish thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/foolish/thesaurus/synonyms>.
MLASmart Define. "foolish thesaurus" 24 March 2016. Web. 21 September 2026. <https://smartdefine.org/foolish/thesaurus/synonyms>