flatness

• POS: Noun
• HYPHEN: flat=ness

CIDE DICTIONARY

flatness, n. 

•  The quality or state of being flat.  [1913 Webster]
•  Eveness of surface; want of relief or prominence; the state of being plane or level.  [1913 Webster]
•  Want of vivacity or spirit; prostration; dejection; depression.  [1913 Webster]
•  Want of variety or flavor; dullness; insipidity.  [1913 Webster]
•  Depression of tone; the state of being below the true pitch; -- opposed to sharpness or acuteness.  [1913 Webster]

ROGET THESAURUS

flatness

Dullness

N dullness, heaviness, flatness, infestivity &c, stupidity want of originality, dearth of ideas, prose, matter of fact, heavy book, conte a dormir debout, platitude, dull, dull as ditch water, unentertaining, uninteresting, flat, dry as dust, unfunny, unlively, logy, unimaginative, insulse, dry as dust, prosy, prosing, prosaic, matter of fact, commonplace, pedestrian, pointless, weary stale flat and unprofitable, stupid, slow, flat, insipid, vapid, humdrum, monotonous, melancholic, stolid plodding, boring, tiresome, tedious, davus sum non Aedipus, deadly dull and boring, DDB.

Horizontality

N horizontality, flatness, level, plane, stratum, dead level, dead flat, level plane, recumbency, lying down, reclination, decumbence, decumbency, discumbency, proneness, accubation, supination, resupination, prostration, azimuth, plain, floor, platform, bowling green, cricket ground, croquet ground, croquet lawn, billiard table, terrace, estrade, esplanade, parterre, table land, plateau, ledge, butte, mesa (plain), level, spirit level, horizontal, level, even, plane, flat, flat as a billiard table, flat as a bowling green, alluvial, calm, calm as a mill pond, smooth, smooth as glass, recumbent, decumbent, procumbent, accumbent, lying, prone, supine, couchant, jacent, prostrate, recubant, horizontally, on one's back, on all fours, on its beam ends.

Flatness

N flatness, smoothness, plane, level, plate, platter, table, tablet, slab, flat, plane, even, flush, scutiform, discoid, level, flat as a pancake, flat as a fluke, flat as a flounder, flat as a board, flat as my hand.