1. (noun) two-dimensionality, flatness, planeness
the property of having two dimensions
Synonyms: mat, phlegm, lustrelessness, lethargy, lusterlessness, matte, flatness, languor, sluggishness, matt, planeness, two-dimensionality
2. (noun) flatness
a want of animation or brilliance
Synonyms: mat, two-dimensionality, phlegm, lustrelessness, lusterlessness, matte, lethargy, sluggishness, languor, planeness, matt
3. (noun) flatness
a deficiency in flavor
Synonyms: mat, two-dimensionality, phlegm, lustrelessness, lusterlessness, matte, lethargy, sluggishness, languor, planeness, matt
4. (noun) flatness, lusterlessness, lustrelessness, mat, matt, matte
the property of having little or no contrast; lacking highlights or gloss
Synonyms: mat, two-dimensionality, phlegm, lustrelessness, gym mat, lusterlessness, matte, flatness, lethargy, matting, sluggishness, languor, planeness, matt
5. (noun) languor, lethargy, sluggishness, phlegm, flatness
inactivity; showing an unusual lack of energy
Synonyms: lusterlessness, sluggishness, matt, sputum, dreaminess, inanition, flatness, emotionlessness, lustrelessness, lethargy, languor, slackness, unemotionality, listlessness, impassiveness, phlegm, impassivity, lassitude, indifference, two-dimensionality, matte, stolidity, mat, planeness
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Synonyms and Antonyms of flatness 
