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Definition of flat:

  1. A car without a roof, the body of which is a platform without sides; a platform car.
  2. A character [] before a note, indicating a tone which is a half step or semitone lower.
  3. A dull fellow; a simpleton; a numskull.
  4. A flat- bottomed boat, without keel, and of small draught.
  5. A floor, loft, or story in a building; especially, a floor of a house, which forms a complete residence in itself.
  6. A homaloid space or extension.
  7. A horizontal vein or ore deposit auxiliary to a main vein; also, any horizontal portion of a vein not elsewhere horizontal.
  8. A level surface, without elevation, relief, or prominences; an extended plain; specifically, in the United States, a level tract along the along the banks of a river; as, the Mohawk Flats.
  9. A level tract lying at little depth below the surface of water, or alternately covered and left bare by the tide; a shoal; a shallow; a strand.
  10. A platform on wheel, upon which emblematic designs, etc., are carried in processions.
  11. A straw hat, broad- brimmed and low- crowned.
  12. Below the true pitch; hence, as applied to intervals, minor, or lower by a half step; as, a flat seventh; A flat.
  13. Clear; unmistakable; peremptory; absolute; positive; downright.
  14. Flattening at the ends; - said of certain fruits.
  15. Having a head at a very obtuse angle to the shaft; - said of a club.
  16. Having an even and horizontal surface, or nearly so, without prominences or depressions; level without inclination; plane.
  17. In a flat manner; directly; flatly.
  18. Lacking liveliness of commercial exchange and dealings; depressed; dull; as, the market is flat.
  19. Lying at full length, or spread out, upon the ground; level with the ground or earth; prostrate; as, to lie flat on the ground; hence, fallen; laid low; ruined; destroyed.
  20. Not having an inflectional ending or sign, as a noun used as an adjective, or an adjective as an adverb, without the addition of a formative suffix, or an infinitive without the sign to. Many flat adverbs, as in run fast, buy cheap, are from AS. adverbs in - e, the loss of this ending having made them like the adjectives. Some having forms in ly, such as exceeding, wonderful, true, are now archaic.
  21. Not sharp or shrill; not acute; as, a flat sound.
  22. Something broad and flat in form
  23. Sonant; vocal; - applied to any one of the sonant or vocal consonants, as distinguished from a nonsonant ( or sharp) consonant.
  24. Tasteless; stale; vapid; insipid; dead; as, fruit or drink flat to the taste.
  25. The flat part, or side, of anything; as, the broad side of a blade, as distinguished from its edge.
  26. To become flat, or flattened; to sink or fall to an even surface.
  27. To depress in tone, as a musical note; especially, to lower in pitch by half a tone.
  28. To fall form the pitch.
  29. To make flat; to flatten; to level.
  30. To render dull, insipid, or spiritless; to depress.
  31. Unanimated; dull; uninteresting; without point or spirit; monotonous; as, a flat speech or composition.
  32. Wanting relief; destitute of variety; without points of prominence and striking interest.
  33. Without allowance for accrued interest.

Synonyms:

plane, flavourless, bland, straight, sterile, sheer, spiritless, politic, limited, fixed, out-and-out, arrant, unpleated, matted, set, flat-out, pure, underdeveloped, savorless, multidimensional, taste, prosaic, flavorless, dry, now, uninspired, forthwith, firm, two-dimensional, even, regressive, tight, matt, extended, damned, prostrate, right away, straighten, noneffervescent, unreserved, direct, unqualified, suave, monotone, dim, positive, vapid, pedestrian, complete, solid, categorical, lying down, colorless, big, drab, unwavering, like a shot, earthbound, straightaway, deflated, unstimulating, straight off, thorough, instantly, flatcar, unrelieved, recumbent, all-out, unlimited, blooming, thin, lifeless, excite, fallen, unconditioned, lusterless, thoroughgoing, immediately, supine, change, light, planar, unbounded, muddy, directly, unshaded, perfect, arid, unconditional, procumbent, categoric, tied, flatten, savourless, insipid, unleavened, downright, level, flatbed, horizontal, unseasoned, tasteless, matte, humdrum, prone, matter-of-fact, unimaginative, murky, mat, colors, aseptic, lackluster, rough, crashing, raised, unexciting, dull, decumbent, flattened, stodgy, punctured, consummate, total, unraised, at once, compressed, monotonic, apartment, utter, flat tire, unmitigated, unerect, unfolded.

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