·noun The quality or state of being flat.
II. Flatness ·noun Want of variety or flavor; dullness; insipidity.
III. Flatness ·noun Want of vivacity or spirit; prostration; dejection; depression.
IV. Flatness ·noun Eveness of surface; want of relief or prominence; the state of being plane or level.
V. Flatness ·noun Depression of tone; the state of being below the true pitch;
— opposed to sharpness or acuteness.