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45 entries under plain topic. ×

2
blah(adjective, dull, weak, simple)
2
boring(adjective, dull, weak, simple)
2
flat(adjective, dull, weak, mild)
2
ho hum(expression, adjective, dull, weak, simple)
2
humdrum(adjective, dull, weak, mild)
2
nothing(adjective, dull, weak, mild)
1
banal(adjective, dull, weak, mild)
1
bland(adjective, dull, weak, mild)
1
dull(adjective, weak, mild, ordinary)
1
flavorless(adjective, dull, weak, mild)
1
insipid(adjective, dull, weak, simple)
1
milk-and-water(adjective, dull, weak, mild)
1
monotonous(adjective, dull, weak, simple)
1
nerdy(adjective, dull, weak, mild)
1
pabulum(adjective, dull, weak, mild)
1
sapless(adjective, dull, weak, mild)
1
tame(adjective, dull, weak, mild)
1
tasteless undistinctive(expression, adjective, dull, weak)
1
tedious(adjective, dull, weak, simple)
1
unexciting(adjective, dull, weak, mild)
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APASmart Define. (2015). dull as dishwater thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/dull_as_dishwater/thesaurus/synonyms
ChicagoSmart Define. 2015. "dull as dishwater thesaurus" https://smartdefine.org/dull_as_dishwater/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2015, dull as dishwater thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/dull_as_dishwater/thesaurus/synonyms>.
MLASmart Define. "dull as dishwater thesaurus" 10 April 2015. Web. 30 September 2026. <https://smartdefine.org/dull_as_dishwater/thesaurus/synonyms>