114 entries under simple topic. ×

11
unintelligent(adjective, dull, mind, think)
10
moronic(adjective, dull, mind, think)
10
wearisome(adjective, dull, stupid, boring)
9
doltish(adjective, dull, heavy, silly)
9
dopey(adjective, dull, quiet, weak)
8
gentle(adjective, calm, quiet, light, cool)
7
slow-witted(adjective, dull, ability, mind)
7
soft(adjective, calm, quiet, increase, light)
7
weak-minded(adjective, dull, ability, mind)
6
calm(verb, adjective, control, quiet, light)
6
feeble-minded(adjective, dull, ability, offensive)
6
half-witted(adjective, dull, ability, offensive)
6
idiotic(adjective, dull, mind, think)
6
lumpish(adjective, dull, heavy, stupid)
6
unresponsive(adjective, dull, quiet, flat)
5
imbecile(adjective, dull, silly, foolish)
5
relaxed(adjective, calm, quiet, light, cool)
4
simple-minded(adjective, dull, ability, silly)
4
simpleminded(adjective, dull, silly, foolish)
3
brainless(adjective, dull, silly, foolish)
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APASmart Define. (2016). slow thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/slow/thesaurus/synonyms
ChicagoSmart Define. 2016. "slow thesaurus" https://smartdefine.org/slow/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2016, slow thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/slow/thesaurus/synonyms>.
MLASmart Define. "slow thesaurus" 29 March 2016. Web. 21 September 2026. <https://smartdefine.org/slow/thesaurus/synonyms>