1,185 entry under adjective topic. ×

20
sombre(characteristic, unhappy, dark, property)
19
apathetic(calm, quiet, tough, flat)
19
colourless
19
inert(upset, quiet, moving, flat)
19
listless(calm, quiet, bad, weak)
19
unsurprising
18
grey(leaden, steely)
18
languid(quiet, weak, flat, weakness)
17
dim-witted(simple, slow, foolish, stupid)
17
obscure(verb, quiet, clear, weak)
17
pale(verb, quiet, beat, reduce)
17
slack(quiet, increase, weakness, low)
17
slow-witted(simple, ability, slow, stupid)
17
unimaginative(simple, tough, flat, excite)
16
muffled(quiet, weak, soft, gentle)
16
murky(obscure, dark, gloomy, dirty)
16
overcast(verb, clear, obscure, dark)
16
soporific(noun, quiet, dry, boring)
16
uninspired(set, flat, silly, common)
15
cloudy(obscure, dark, gloomy, miserable)
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APASmart Define. (2016). dull thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/dull/thesaurus/synonyms
ChicagoSmart Define. 2016. "dull thesaurus" https://smartdefine.org/dull/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, dull thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/dull/thesaurus/synonyms>.
MLASmart Define. "dull thesaurus" 29 March 2016. Web. 25 September 2026. <https://smartdefine.org/dull/thesaurus/synonyms>