53 entries under simple topic. ×

46
stupid(noun, adjective, dull, ability)
38
foolish(adjective, dull, slow, silly)
30
dull(verb, adjective, calm, quiet)
26
idiotic(adjective, dull, slow, silly)
24
moronic(adjective, dull, slow, silly)
23
doltish(adjective, dull, ability, slow)
22
thick(adjective, dull, ability, slow)
22
dense(adjective, dull, ability, slow)
20
dim-witted(adjective, dull, slow, foolish)
19
dim(adjective, dull, slow, foolish)
15
obtuse(adjective, dull, ability, slow)
15
brainless(adjective, dull, slow, silly)
14
slow(adjective, dull, heavy, silly)
14
feeble-minded(adjective, dull, slow, foolish)
13
dopey(adjective, dull, slang, ability)
11
half-witted(adjective, dull, slow, silly)
11
imbecilic(adjective, dull, slow, silly)
11
inane(adjective, dull, slow, silly)
11
stolid(adjective, dull, slow, foolish)
9
unintelligent(adjective, dull, slow, silly)
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APASmart Define. (2016). dumb thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/dumb/thesaurus/synonyms
ChicagoSmart Define. 2016. "dumb thesaurus" https://smartdefine.org/dumb/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, dumb thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/dumb/thesaurus/synonyms>.
MLASmart Define. "dumb thesaurus" 29 March 2016. Web. 20 September 2026. <https://smartdefine.org/dumb/thesaurus/synonyms>