1,185 entry under adjective topic. ×

15
faint(verb, quiet, reduce, light)
15
fatuous(silly, foolish, stupid, crazy)
15
ho-hum(simple, flat, plain, ordinary)
15
indistinct(quiet, weak, soft, gentle)
15
mundane(boring, simple, ordinary, tedious)
15
plain(weak, simple, tough, flat)
15
sad(unhappy, dark, black, gloom)
15
spiritless(quiet, weak, kind, soft)
15
stale(set, hard, weak, simple)
14
colorless(beat, light, weak, simple)
14
damp(verb, upset, trouble, quiet)
14
indifferent(calm, quiet, mean, flat)
14
insensitive(noun, quiet, rough, low)
14
lethargic(calm, flat, slow, careless)
14
phlegmatic(calm, tough, slow, relaxed)
14
simple(ability, slow, plain, pure)
14
somber(upset, quiet, severe, sad)
14
unexciting(weak, plain, mild, stupid)
14
vague(weak, soft, gentle, obscure)
14
weak(hard, light, simple, soft)
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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>