161 entries under simple topic. ×

66
boring(adjective, dreary, colorless, tedious, drab)
51
tedious(adjective, boring, uninteresting, dreary, monotonous)
47
flat(adjective, calm, quiet, set, hard)
45
dim(verb, adjective, action, characteristic, quiet)
41
slow(verb, adjective, stop, upset, trouble)
38
obtuse(noun, adjective, sharp, slow)
37
prosaic(adjective, set, weak, tough)
36
monotonous(adjective, boring, uninteresting, uneventful, tedious)
35
stupid(adjective, flat, rough, slow)
35
drab(adjective, characteristic, hard, weak)
31
dead(adjective, hard, weak, flat)
30
humdrum(adjective, weak, excite, slow)
29
lifeless(adjective, calm, weak, tough)
24
dry(adjective, calm, hard, tough)
23
dumb(verb, adjective, calm, quiet)
23
dense(adjective, slow, dark, gloomy)
23
stolid(noun, adjective, calm, tough)
22
thick(adjective, obscure, warm, slow)
22
vapid(adjective, boring, uninteresting, flat, tedious)
21
doltish(adjective, slow, careless, foolish)
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APASmart Define. (2016). dull thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/dull/thesaurus/synonyms
ChicagoSmart Define. 2016. "dull thesaurus" https://smartdefine.org/dull/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2016, dull thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/dull/thesaurus/synonyms>.
MLASmart Define. "dull thesaurus" 29 March 2016. Web. 21 September 2026. <https://smartdefine.org/dull/thesaurus/synonyms>