(noun, adjective, verb, adverb)


1. having a surface without slope, tilt in which no part is higher or lower than another

- a flat desk

- skirts sewn with fine flat seams

Similar word(s): even, level, plane

2. having a relatively broad surface in relation to depth or thickness

- flat computer monitors

Similar word(s): planar

3. not modified or restricted by reservations

- a flat refusal

Similar word(s): unqualified, categoric, categorical, unconditional

4. stretched out and lying at full length along the ground

- found himself lying flat on the floor

Similar word(s): unerect, prostrate

5. lacking contrast or shading between tones

6. (of a musical note) lowered in pitch by one chromatic semitone

- B flat

7. flattened laterally along the whole length (e.g., certain leafstalks or flatfishes)

Similar word(s): thin, compressed

8. lacking taste or flavor or tang

Similar word(s): tasteless, bland, flavorless, flavourless, insipid, savorless, savourless, vapid

9. lacking stimulating characteristics; uninteresting

- a flat joke

Similar word(s): unexciting, unstimulating, bland

10. having lost effervescence

- flat beer

- a flat cola

Similar word(s): noneffervescent

11. sounded or spoken in a tone unvarying in pitch

Similar word(s): unmodulated, monotone, monotonic, monotonous

12. horizontally level

- a flat roof

Similar word(s): horizontal

13. lacking the expected range or depth; not designed to give an illusion or depth

- a flat two-dimensional painting

Similar word(s): multidimensional

14. not reflecting light; not glossy

- flat wall paint

Similar word(s): dull, mat, matt, matte, matted

15. commercially inactive

- flat sales for the month

- prices remained flat

- a flat market

Similar word(s): inactive

Sentences with flat as an adjective:

- The land around here is flat.

- The party was a bit flat.

- His claim was in flat contradiction to experimental results.

- I'm not going to the party and that's flat.

- That girl is completely flat on both sides.

- The market is flat.

- Many flat adverbs, as in 'run fast', 'buy cheap', etc. are from Old English.


1. with flat sails

- sail flat against the wind

2. in a forthright manner; candidly or frankly

- came out flat for less work and more pay

Similar word(s): directly, straight

Sentences with flat as an adverb:

- Spread the tablecloth flat over the table.

- I asked him if he wanted to marry me and he turned me down flat.

- He can run a mile in four minutes flat.

- I am flat broke this month.


1. a level tract of land

- the salt flats of Utah

Definition categories: object, champaign, field, plain

2. a shallow box in which seedlings are started

Definition categories: man–made, box

3. a musical notation indicating one half step lower than the note named

Definition categories: communication

4. freight car without permanent sides or roof

Similar word(s): flatbed, flatcar

Definition categories: man–made

5. a deflated pneumatic tire

Definition categories: man–made

6. scenery consisting of a wooden frame covered with painted canvas; part of a stage setting

Definition categories: man–made, scene, scenery

7. a suite of rooms usually on one floor of an apartment house

Similar word(s): apartment

Definition categories: man–made, housing, lodging

Sentences with flat as a noun:

- She liked to walk in her flats more than in her high heels.

- a flat of strawberries


1. (poker slang) To make a flat call; to call without raising.

2. (intransitive) To become flat or flattened; to sink or fall to an even surface.

3. (intransitive, music, colloquial) To fall from the pitch.

4. (transitive, music) To depress in tone, as a musical note; especially, to lower in pitch by half a tone.

5. (transitive, dated) To make flat; to flatten; to level.

6. (transitive, dated) To render dull, insipid, or spiritless; to depress.