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; inspidity.

5.

Depression of tone; the state of being below the true pitch; -- opposed to sharpness or acuteness.

© Webster 1913.