84 entries under simple topic. ×

6
insensate(adjective, dull, ability, slow)
6
obtuse(adjective, dull, careless, silly)
5
dense(adjective, dull, slow, silly)
5
feebleminded(adjective, weak, silly, stupid)
5
inconsistent(adjective, wrong, silly, stupid)
5
pointless(adjective, dull, slow, silly)
4
nitwitted(adjective, silly, stupid, senseless)
3
slow(adjective, dull, silly, stupid)
2
bonkers(adjective, silly, crazy, mad)
2
deranged(adjective, wild, silly, stupid)
2
futile(adjective, dull, slow, silly)
2
gullible(adjective, dull, slow, silly)
2
naive(dull, innocent, witless, trusting)
2
nerdy(adjective, weak, silly, thoughtless)
2
unhinged(silly, stupid, unsound, unwise)
1
unbalanced(adjective, wild, silly, stupid)
1
bedlamite(adjective, silly, crazy, mad)
1
cracked(adjective, wild, silly, stupid)
1
in the ozone(expression, idiom, silly, crazy)
1
susceptible(innocent, naive, trusting, wide-eyed)
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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>