83 entries under plain topic. ×

10
common(adjective, dull, mean, simple, moderate)
10
dead(adjective, dull, simple, flat)
10
ho-hum(adjective, dull, simple, clean)
9
drab(adjective, dull, simple, clean)
9
hackneyed(adjective, simple, moderate, flat, clean)
9
lifeless(adjective, dull, weak, simple)
9
prosy(adjective, dull, simple, flat)
9
unimaginative(adjective, dull, simple, flat)
8
blah(adjective, dull, weak, simple, flat)
8
everyday(adjective, dull, simple, moderate)
7
stale(adjective, dull, simple, flat, clean)
7
trite(adjective, dull, simple, flat)
7
uninspiring(adjective, dull, weak, simple, flat)
6
irksome(adjective, dull, simple, excite, clean)
6
workaday(adjective, dull, simple, common)
5
colorless(adjective, dull, simple, flat, clean)
4
prose(noun, adjective, simple, clean)
3
garden-variety(adjective, dull, simple, moderate, clean)
3
unexceptional(adjective, dull, simple, moderate, clean)
2
dull as dishwater(expression, adjective, idiom, dull, weak)
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APASmart Define. (2016). humdrum thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/humdrum/thesaurus/synonyms
ChicagoSmart Define. 2016. "humdrum thesaurus" https://smartdefine.org/humdrum/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, humdrum thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/humdrum/thesaurus/synonyms>.
MLASmart Define. "humdrum thesaurus" 23 March 2016. Web. 24 September 2026. <https://smartdefine.org/humdrum/thesaurus/synonyms>