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Definition of flatness:

  1. Depression of tone; the state of being below the true pitch; - opposed to sharpness or acuteness.
  2. Eveness of surface; want of relief or prominence; the state of being plane or level.
  3. The quality or state of being flat.
  4. Want of variety or flavor; dullness; insipidity.
  5. Want of vivacity or spirit; prostration; dejection; depression.


slackness, jejuneness, dreaminess, asepticism, colorlessness, languor, lifelessness, drabness, sputum, matting, impassiveness, weariness, matte, mat, lethargy, emotionlessness, stolidity, sluggishness, phlegm, gym mat, two-dimensionality, impassivity, inanition, planeness, sterility, lusterlessness, indifference, dreariness, lassitude, stodginess, flavorlessness, insipidness, vapidness, dryness, matt, listlessness, unemotionality, excite, sterileness, lustrelessness.

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