5
unanswered(adjective, calm, quiet, humble, shy)
5
uncommunicative(adjective, close, quiet, soft, low)
5
unreciprocated(adjective, calm, quiet, humble, shy)
5
without response(adjective, calm, quiet, humble, shy)
4
dizzy(adjective, confused)
4
mad
4
simple-minded(adjective, dull, simple, slow, silly)
4
tongueless(silent, voiceless, aphony)
4
aphasic(silent, voiceless)
4
batty(adjective, foolish, crazy, impulsive, insane)
4
cloddish
4
close(adjective, quiet, soft, low, restrained)
4
cuckoo(noun, adjective)
4
daffy(adjective, simple, slow, silly, foolish)
4
dull-witted
4
feebleminded(adjective, foolish, stupid, unintelligent, mindless)
4
gormless
4
ludicrous(adjective, dull, foolish, stupid, half-baked)
4
lumpish(adjective, dull, simple, slow, heavy)
4
naive(dull, unintelligent, witless)
10 years ago|23k views|share |citing 
APASmart Define. (2016). dumb thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/dumb/thesaurus/synonyms
ChicagoSmart Define. 2016. "dumb thesaurus" https://smartdefine.org/dumb/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, dumb thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/dumb/thesaurus/synonyms>.
MLASmart Define. "dumb thesaurus" 29 March 2016. Web. 23 September 2026. <https://smartdefine.org/dumb/thesaurus/synonyms>