"flatness" in the noun sense
1. two-dimensionality, flatness, planeness
the property of having two dimensions
a want of animation or brilliance
"the almost self-conscious flatness of Hemingway's style"
a deficiency in flavor
"it needed lemon juice to sharpen the flatness of the dried lentils"
4. flatness, lusterlessness, lustrelessness, mat, matt, matte
the property of having little or no contrast lacking highlights or gloss
5. languor, lethargy, sluggishness, phlegm, flatness
inactivity showing an unusual lack of energy
"the general appearance of sluggishness alarmed his friends"
Source: WordNet® (An amazing lexical database of English)
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