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; depression.
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.