144 entries under plain topic. ×

14
colorless(adjective, beat, light, weak, simple)
14
simple(adjective, ability, slow, pure)
14
unexciting(adjective, weak, mild, stupid)
14
weak(adjective, hard, light, simple, soft)
13
irksome(adjective, simple, excite, stupid)
13
routine(noun, adjective, set, weak, simple)
13
tame(adjective, weak, kind, simple, soft)
12
trite(adjective, set, hard, simple, flat)
12
uninspiring(adjective, boring, uninteresting, tedious, dreary)
11
blah(adjective, calm, quiet, weak, simple)
11
common(adjective, boring, ordinary, commonplace, set)
11
hackneyed(adjective, set, hard, simple, flat)
11
pedestrian(adjective, set, simple, flat, excite)
11
uneventful(adjective, simple, low, ordinary)
10
banal(adjective, set, hard, weak, simple)
10
soft(adjective, quiet, increase, light, weak)
10
tasteless(adjective, hard, weak, flat, rough)
9
lackluster(adjective, light, simple, flat, excite)
9
prosy(adjective, weak, simple, tough)
8
everyday(adjective, simple, pure, common)
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APASmart Define. (2016). dull thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/dull/thesaurus/synonyms
ChicagoSmart Define. 2016. "dull thesaurus" https://smartdefine.org/dull/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, dull thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/dull/thesaurus/synonyms>.
MLASmart Define. "dull thesaurus" 29 March 2016. Web. 23 September 2026. <https://smartdefine.org/dull/thesaurus/synonyms>