Synonyms|296Antonyms|99|Broader|12Narrower|4Related|201
4
planeness(noun, smoothness)
4
sameness(noun, melancholy, routine, dullness, apathy)
4
sluggishness(noun, prostration)
4
sterility(noun, excite, lack, routine, dullness)
4
tastelessness(noun, weakness, dullness, tastelessness)
3
asepticism(noun, excite, lack, routine, dullness)
3
banality(noun, dull, dullness, commonplace, tag)
3
colorlessness(noun, excite, depression, lack, routine)
3
deadness(noun, non-resonance)
3
dimness
3
drabness(noun, excite, depression, lack, routine)
3
flat(noun, prostration)
3
horizontality(noun, horizontality)
3
lustrelessness
3
matte
3
phlegm
3
plain(noun, prairie)
3
platitude(noun, dull, saying)
3
prose
3
staleness(noun, routine, dullness, slowness, tedium)
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APASmart Define. (2015). flatness thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/flatness/thesaurus/synonyms
ChicagoSmart Define. 2015. "flatness thesaurus" https://smartdefine.org/flatness/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, flatness thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/flatness/thesaurus/synonyms>.
MLASmart Define. "flatness thesaurus" 15 June 2015. Web. 22 September 2026. <https://smartdefine.org/flatness/thesaurus/synonyms>