133 entries under flat topic. ×

4
corny(adjective, dull, set, hard)
4
dry(adjective, dull, hard, simple)
4
musty(adjective, dull, set, hard)
4
prosy(adjective, dull, simple, rough)
4
repetitious(adjective, dull, hard, ordinary)
4
tiresome(adjective, dull, ordinary, dry)
3
bromidic(adjective, dull, set, silly)
3
level(noun, adjective, smooth, plain)
3
moth-eaten(adjective, dull, set, hard)
3
steady(adjective, calm, smooth, level)
3
vapid(adjective, dull, set, simple)
3
worn-out(adjective, dull, set, hard)
2
akin(adjective, calm, smooth, plain)
2
alike(adjective, adverb, calm, smooth)
2
blah(adjective, dull, simple, plain)
2
colorless(adjective, dull, simple, rough)
2
consistent(adjective, calm, smooth, reasonable)
2
dead(adjective, dull, hard, simple)
2
ho hum(expression, adjective, dull, stupid)
2
hokey(adjective, dull, set, silly)
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APASmart Define. (2016). common thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/common/thesaurus/synonyms
ChicagoSmart Define. 2016. "common thesaurus" https://smartdefine.org/common/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2016, common thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/common/thesaurus/synonyms>.
MLASmart Define. "common thesaurus" 23 March 2016. Web. 21 September 2026. <https://smartdefine.org/common/thesaurus/synonyms>