105 entries under stupid topic. ×

5
half-baked(adjective, dull, weak, simple, slow)
5
obtuse(adjective, dull, simple, slow, silly)
5
scatterbrained(adjective, simple, slow, boring)
5
thickheaded(adjective, simple, slow)
4
blockheaded(adjective, simple, slow, foolish)
4
dimwitted(adjective, simple, silly, foolish)
4
dippy(weak, simple, silly, foolish)
4
featherbrained(adjective, simple, careless, foolish)
4
feeble-minded(adjective, simple, slow, boring)
4
frivolous(adjective, simple, careless, foolish)
4
unintellectual(adjective, simple, slow, boring)
3
beaglebrained
3
boneheaded(adjective, simple, slow, silly)
3
clueless
3
cushion-witted
3
dense(adjective, dull, simple, slow, silly)
3
harebrained(adjective, weak, simple, careless, silly)
3
illiterate(adjective, silly, green, fat)
3
ludicrous(adjective, dull, weak, simple, silly)
3
ridiculous(adjective, weak, simple, silly, foolish)
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APASmart Define. (2016). brainless thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/brainless/thesaurus/synonyms
ChicagoSmart Define. 2016. "brainless thesaurus" https://smartdefine.org/brainless/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, brainless thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/brainless/thesaurus/synonyms>.
MLASmart Define. "brainless thesaurus" 24 March 2016. Web. 24 September 2026. <https://smartdefine.org/brainless/thesaurus/synonyms>