| aflame | (adjective) lighted up by or as by fire or flame | Synonyms: ablaze, afire, aflare, alight, on fire |
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| (adjective) keenly excited (especially sexually) or indicating excitement | Synonyms: ablaze, aroused |
| aflare | (adjective) lighted up by or as by fire or flame | Synonyms: ablaze, afire, aflame, alight, on fire |
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| (adjective) streaming or flapping or spreading wide as if in a current of air | Synonyms: flaring |
| biflagellate | (adjective) having two flagella | - |
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| camouflaged | (adjective) made invisible by means of protective coloring | - |
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| deflated | (adjective) brought low in spirit | Synonyms: chapfallen, chopfallen, crestfallen |
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| deflationary | (adjective) associated with or tending to cause decreases in consumer prices or increases in the purchasing power of money | - |
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| flabbergasted | (adjective) as if struck dumb with astonishment and surprise | Synonyms: dumbfounded, dumbstricken, dumbstruck, dumfounded, stupefied, thunderstruck |
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| flabby | (adjective) out of condition; not strong or robust; incapable of exertion or endurance | Synonyms: flaccid, soft |
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| flaccid | (adjective) drooping without elasticity; wanting in stiffness | - |
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| (adjective) out of condition; not strong or robust; incapable of exertion or endurance | Synonyms: flabby, soft |
| flagellate | (adjective) having or resembling a lash or whip (as does a flagellum) | Synonyms: flagellated, lash-like, whiplike |
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| flagellated | (adjective) having or resembling a lash or whip (as does a flagellum) | Synonyms: flagellate, lash-like, whiplike |
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| flagging | (adjective) weak from exhaustion | Synonyms: drooping |
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| flagitious | (adjective) shockingly brutal or cruel | Synonyms: atrocious, grievous, monstrous |
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| (adjective) extremely wicked, deeply criminal | Synonyms: heinous |
| flagrant | (adjective) conspicuously and outrageously bad or reprehensible | Synonyms: crying, egregious, glaring, gross, rank |
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| flakey | (adjective) made of or resembling flakes | Synonyms: flaky |
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| (adjective) made of or easily forming flakes | Synonyms: flaky |
| (adjective) conspicuously or grossly unconventional or unusual | Synonyms: bizarre, eccentric, flaky, freakish, freaky, gonzo, off-the-wall, outlandish, outre |
| flaky | (adjective) made of or resembling flakes | Synonyms: flakey |
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| (adjective) made of or easily forming flakes | Synonyms: flakey |
| (adjective) conspicuously or grossly unconventional or unusual | Synonyms: bizarre, eccentric, flakey, freakish, freaky, gonzo, off-the-wall, outlandish, outre |
| flamboyant | (adjective) elaborately or excessively ornamented | Synonyms: aureate, florid |
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| (adjective) marked by ostentation but often tasteless | Synonyms: showy, splashy |
| flameproof | (adjective) resistant to catching fire | Synonyms: flame-retardant |
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| flaming | (adjective) passionate or quick-tempered | Synonyms: fiery |
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| (adjective) informal intensifiers | Synonyms: bally, blinking, bloody, blooming, crashing, fucking |
| flammable | (adjective) easily ignited | Synonyms: inflammable |
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| flappy | (adjective) having a tendency to flap | - |
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| flaring | (adjective) streaming or flapping or spreading wide as if in a current of air | Synonyms: aflare |
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| flash | (adjective) tastelessly showy | Synonyms: brassy, cheap, flashy, garish, gaudy, gimcrack, loud, meretricious, tacky, tatty, tawdry, trashy |
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| flashy | (adjective) (used especially of clothes) marked by conspicuous display | Synonyms: gaudy, jazzy, showy, sporty |
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| (adjective) tastelessly showy | Synonyms: brassy, cheap, flash, garish, gaudy, gimcrack, loud, meretricious, tacky, tatty, tawdry, trashy |
| 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 |
| 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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| 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 |
| flattened | (adjective) having been flattened | Synonyms: planate |
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| flattering | (adjective) showing or representing to advantage | - |
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| (adjective) obsequiously complimentary | Synonyms: adulatory |
| 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 |
| flaunty | (adjective) inclined to flaunt | - |
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| flavorful | (adjective) full of flavor | Synonyms: flavorous, flavorsome, flavourful, flavourous, flavoursome, sapid, saporous |
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| flavorless | (adjective) lacking taste or flavor or tang | Synonyms: bland, flat, flavourless, insipid, savorless, savourless, vapid |
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| flavorous | (adjective) full of flavor | Synonyms: flavorful, flavorsome, flavourful, flavourous, flavoursome, sapid, saporous |
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| flavorsome | (adjective) full of flavor | Synonyms: flavorful, flavorous, flavourful, flavourous, flavoursome, sapid, saporous |
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| flavourful | (adjective) full of flavor | Synonyms: flavorful, flavorous, flavorsome, flavourous, flavoursome, sapid, saporous |
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| flavourless | (adjective) lacking taste or flavor or tang | Synonyms: bland, flat, flavorless, insipid, savorless, savourless, vapid |
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| flavourous | (adjective) full of flavor | Synonyms: flavorful, flavorous, flavorsome, flavourful, flavoursome, sapid, saporous |
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| flavoursome | (adjective) full of flavor | Synonyms: flavorful, flavorous, flavorsome, flavourful, flavourous, sapid, saporous |
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| flawed | (adjective) having a blemish or flaw | Synonyms: blemished |
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| flawless | (adjective) without a flaw | Synonyms: unflawed |
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| flaxen | (adjective) of hair color; pale yellowish to yellowish brown | Synonyms: sandy |
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| inflamed | (adjective) adorned with tongues of flame | - |
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| (adjective) lighted with red light as if with flames | Synonyms: ablaze, reddened |
| (adjective) resulting from inflammation; hot and swollen and reddened | - |
| inflammable | (adjective) easily ignited | Synonyms: flammable |
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| inflammatory | (adjective) arousing to action or rebellion | Synonyms: incendiary, incitive, instigative, rabble-rousing, seditious |
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| (adjective) characterized or caused by inflammation | - |
| inflatable | (adjective) designed to be filled with air or gas | - |
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| inflated | (adjective) pretentious (especially with regard to language or ideals) | Synonyms: high-flown, high-sounding |
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| (adjective) enlarged beyond truth or reasonableness | Synonyms: hyperbolic |
| inflationary | (adjective) associated with or tending to cause increases in inflation | - |
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| nonflammable | (adjective) impossible to ignite | - |
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| nonflavored | (adjective) without flavoring added | Synonyms: nonflavoured, unflavored, unflavoured |
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| nonflavoured | (adjective) without flavoring added | Synonyms: nonflavored, unflavored, unflavoured |
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| noninflammatory | (adjective) not inflammatory | - |
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| proinflammatory | (adjective) tending to cause inflammation | Synonyms: pro-inflammatory |
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| stagflationary | (adjective) characteristic of or promoting stagflation | - |
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| unflagging | (adjective) tireless | Synonyms: unfailing |
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| (adjective) showing sustained enthusiastic action with unflagging vitality | Synonyms: indefatigable, tireless, unwearying |
| unflappable | (adjective) not easily perturbed or excited or upset; marked by extreme calm and composure | Synonyms: imperturbable |
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| unflattering | (adjective) showing or representing unfavorably | Synonyms: uncomplimentary |
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| unflavored | (adjective) without flavoring added | Synonyms: nonflavored, nonflavoured, unflavoured |
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| unflavoured | (adjective) without flavoring added | Synonyms: nonflavored, nonflavoured, unflavored |
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| unflawed | (adjective) without a flaw | Synonyms: flawless |
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