112 entries under ordinary topic. ×

15
humdrum(adjective, dull, weak, simple, plain)
14
drab(adjective, dull, hard, simple, soft)
14
unimaginative(adjective, dull, simple, tough, excite)
13
dreary(adjective, dull, dark, gloomy)
12
regular(adjective, calm, quiet, smooth, right)
11
banal(adjective, dull, set, hard, weak)
11
arid(adjective, dull, excite, stupid)
11
blah(adjective, calm, dull, quiet, weak)
11
uniform(adjective, calm, dull, quiet, smooth)
11
watery(adjective, dull, hard, weak, plain)
11
wishy-washy(adjective, dull, weak, plain, mild)
10
commonplace(adjective, dull, set, hard, simple)
10
pedestrian(adjective, dull, set, simple, excite)
10
pointless(adjective, dull, property, silly)
10
prosy(adjective, dull, simple, tough, plain)
10
tame(adjective, dull, weak, kind, simple)
10
unexciting(adjective, dull, quiet, weak, slow)
9
colorless(adjective, dull, simple, soft, obscure)
9
dim(adjective, dull, quiet, light, soft)
9
heavy(adjective, dull, dry, boring)
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APASmart Define. (2016). flat thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/flat/thesaurus/synonyms
ChicagoSmart Define. 2016. "flat thesaurus" https://smartdefine.org/flat/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, flat thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/flat/thesaurus/synonyms>.
MLASmart Define. "flat thesaurus" 1 March 2016. Web. 23 September 2026. <https://smartdefine.org/flat/thesaurus/synonyms>