| flat | (adjective) (of a musical note) lowered in pitch by one chromatic semitone | - |
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| (adjective) lacking contrast or shading between tones | - |
| (adjective) not reflecting light; not glossy | Synonyms: mat, matt, matte, matted |
| (adjective) having a surface without slope, tilt in which no part is higher or lower than another | Synonyms: level, plane |
| (adjective) horizontally level | - |
| (adjective) commercially inactive | - |
| (adjective) lacking the expected range or depth; not designed to give an illusion or depth | Synonyms: 2-dimensional, two-dimensional |
| (adjective) having lost effervescence | - |
| (adjective) having a relatively broad surface in relation to depth or thickness | - |
| (adjective) lacking taste or flavor or tang | Synonyms: bland, flavorless, flavourless, insipid, savorless, savourless, vapid |
| (adjective) flattened laterally along the whole length (e.g., certain leafstalks or flatfishes) | Synonyms: compressed |
| (adjective) stretched out and lying at full length along the ground | Synonyms: prostrate |
| (adjective) sounded or spoken in a tone unvarying in pitch | Synonyms: monotone, monotonic, monotonous |
| (adjective) not modified or restricted by reservations | Synonyms: categoric, categorical, unconditional |
| (adjective) lacking stimulating characteristics; uninteresting | Synonyms: bland |
| (noun) a suite of rooms usually on one floor of an apartment house | Synonyms: apartment |
| (noun) scenery consisting of a wooden frame covered with painted canvas; part of a stage setting | - |
| (noun) a deflated pneumatic tire | Synonyms: flat tire |
| (noun) freight car without permanent sides or roof | Synonyms: flatbed, flatcar |
| (noun) a shallow box in which seedlings are started | - |
| (noun) a musical notation indicating one half step lower than the note named | - |
| (noun) a level tract of land | - |
| (adverb) in a forthright manner; candidly or frankly | Synonyms: directly, straight |
| (adverb) with flat sails | - |
| flatbed | (noun) an open truck bed or trailer with no sides; used to carry large heavy objects | - |
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| (noun) freight car without permanent sides or roof | Synonyms: flat, flatcar |
| flatboat | (noun) a flatbottom boat for carrying heavy loads (especially on canals) | Synonyms: barge, hoy, lighter |
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| flatbottom | (adjective) having a flat bottom | Synonyms: flat-bottom, flat-bottomed, flatbottomed |
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| flatbottomed | (adjective) having a flat bottom | Synonyms: flat-bottom, flat-bottomed, flatbottom |
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| flatbread | (noun) any of various breads made from usually unleavened dough | - |
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| flatbrod | (noun) the thin wafer-like bread of Scandinavia | - |
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| flatcar | (noun) freight car without permanent sides or roof | Synonyms: flat, flatbed |
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| flatfish | (noun) any of several families of fishes having flattened bodies that swim along the sea floor on one side of the body with both eyes on the upper side | - |
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| (noun) sweet lean whitish flesh of any of numerous thin-bodied fish; usually served as thin fillets | - |
| flatfoot | (noun) a foot afflicted with a fallen arch; abnormally flattened and spread out | Synonyms: pes planus, splayfoot |
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| (noun) a policeman who patrols a given region | Synonyms: patrolman |
| flatfooted | (adjective) forthright and explicit | Synonyms: flat-footed |
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| (adjective) with feet flat on the ground; not tiptoe | Synonyms: flat-footed |
| (adjective) having broad flat feet that usually turn outward | Synonyms: flat-footed |
| (adjective) unprepared and unable to react quickly | Synonyms: flat-footed |
| flathead | (noun) food fish of the Indonesian region of the Pacific; resembles gurnards | - |
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| (noun) pallid bottom-dwelling flat-headed fish with large eyes and a duck-like snout | - |
| flatiron | (noun) an iron that was heated by placing it on a stove | - |
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| flatlet | (noun) a tiny flat | - |
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| flatly | (adverb) in an unqualified manner | Synonyms: categorically, unconditionally |
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| flatmate | (noun) an associate who shares an apartment with you | - |
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| flatness | (noun) the property of having two dimensions | Synonyms: planeness, two-dimensionality |
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| (noun) inactivity; showing an unusual lack of energy | Synonyms: languor, lethargy, phlegm, sluggishness |
| (noun) the property of having little or no contrast; lacking highlights or gloss | Synonyms: lusterlessness, lustrelessness, mat, matt, matte |
| (noun) a deficiency in flavor | - |
| (noun) a want of animation or brilliance | - |
| flats | (noun) footwear (shoes or slippers) with no heel (or a very low heel) | - |
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| flatten | (verb) become flat or flatter | Synonyms: flatten out |
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| (verb) make flat or flatter | - |
| (verb) lower the pitch of (musical notes) | Synonyms: drop |
| flattened | (adjective) having been flattened | Synonyms: planate |
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| flatter | (verb) praise somewhat dishonestly | Synonyms: blandish |
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| flatterer | (noun) a person who uses flattery | Synonyms: adulator |
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| flattering | (adjective) showing or representing to advantage | - |
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| (adjective) obsequiously complimentary | Synonyms: adulatory |
| flattery | (noun) excessive or insincere praise | - |
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| flattop | (noun) a large warship that carries planes and has a long flat deck for takeoffs and landings | Synonyms: aircraft carrier, attack aircraft carrier, carrier |
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| (noun) a closely cropped haircut; usually for men or boys | Synonyms: butch, crew cut |
| flatulence | (noun) pompously embellished language | Synonyms: turgidity, turgidness |
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| (noun) a state of excessive gas in the alimentary canal | Synonyms: flatulency, gas |
| flatulency | (noun) a state of excessive gas in the alimentary canal | Synonyms: flatulence, gas |
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| flatulent | (adjective) generating excessive gas in the alimentary canal | - |
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| (adjective) suffering from excessive gas in the alimentary canal | Synonyms: colicky, gassy |
| flatus | (noun) a reflex that expels intestinal gas through the anus | Synonyms: breaking wind, fart, farting, wind |
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| flatware | (noun) silverware eating utensils | Synonyms: silver |
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| (noun) tableware that is relatively flat and fashioned as a single piece | - |
| flatwork | (noun) ironing that can be done mechanically | Synonyms: flat wash |
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| flatworm | (noun) parasitic or free-living worms having a flattened body | Synonyms: platyhelminth |
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