[syn: languor, lethargy, sluggishness, phlegm, flatness]
The Collaborative International Dictionary of English v.0.48:
flatness \flat"ness\, n.
1. The quality or state of being flat.
2. Eveness of surface; want of relief or prominence; the
state of being plane or level.
3. Want of vivacity or spirit; prostration; dejection;
4. Want of variety or flavor; dullness; insipidity.
5. Depression of tone; the state of being below the true
pitch; -- opposed to sharpness or acuteness.
WordNet (r) 3.0 (2006):
n 1: the property of having two dimensions [syn: two-
dimensionality, flatness, planeness]
2: a want of animation or brilliance; "the almost self-conscious
flatness of Hemingway's style"
3: a deficiency in flavor; "it needed lemon juice to sharpen the
flatness of the dried lentils"
4: the property of having little or no contrast; lacking
highlights or gloss [syn: flatness, lusterlessness,
lustrelessness, mat, matt, matte]
5: inactivity; showing an unusual lack of energy; "the general
appearance of sluggishness alarmed his friends" [syn:
languor, lethargy, sluggishness, phlegm, flatness]