| 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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| flaunt | (noun) the act of displaying something ostentatiously | - |
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| (verb) display proudly; act ostentatiously or pretentiously | Synonyms: flash, ostentate, show off, swank |
| flaunty | (adjective) inclined to flaunt | - |
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| flautist | (noun) someone who plays the flute | Synonyms: flute player, flutist |
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| flavin | (noun) a ketone that forms the nucleus of certain natural yellow pigments like riboflavin | - |
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| flavivirus | (noun) animal viruses belonging to the family Flaviviridae | - |
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| flavone | (noun) a colorless crystalline compound that is part of a number of white or yellow plant pigments | - |
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| flavonoid | (noun) any of a large class of plant pigments having a chemical structure based on or similar to flavone | - |
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| flavor | (noun) the taste experience when a savoury condiment is taken into the mouth | Synonyms: flavour, nip, relish, sapidity, savor, savour, smack, tang |
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| (noun) (physics) the six kinds of quarks | Synonyms: flavour |
| (noun) the general atmosphere of a place or situation and the effect that it has on people | Synonyms: feel, feeling, flavour, look, smell, spirit, tone |
| (verb) lend flavor to | Synonyms: flavour, season |
| flavorer | (noun) something added to food primarily for the savor it imparts | Synonyms: flavoring, flavourer, flavouring, seasoner, seasoning |
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| flavorful | (adjective) full of flavor | Synonyms: flavorous, flavorsome, flavourful, flavourous, flavoursome, sapid, saporous |
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| flavoring | (noun) something added to food primarily for the savor it imparts | Synonyms: flavorer, flavourer, flavouring, seasoner, seasoning |
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| flavorless | (adjective) lacking taste or flavor or tang | Synonyms: bland, flat, flavourless, insipid, savorless, savourless, vapid |
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| flavorlessness | (noun) the property of having no flavor | Synonyms: flavourlessness, savorlessness, savourlessness, tastelessness |
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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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| flavorsomeness | (noun) having an appetizing flavor | Synonyms: flavoursomeness, savoriness |
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| flavour | (noun) the taste experience when a savoury condiment is taken into the mouth | Synonyms: flavor, nip, relish, sapidity, savor, savour, smack, tang |
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| (noun) (physics) the six kinds of quarks | Synonyms: flavor |
| (noun) the general atmosphere of a place or situation and the effect that it has on people | Synonyms: feel, feeling, flavor, look, smell, spirit, tone |
| (verb) lend flavor to | Synonyms: flavor, season |
| flavourer | (noun) something added to food primarily for the savor it imparts | Synonyms: flavorer, flavoring, flavouring, seasoner, seasoning |
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| flavourful | (adjective) full of flavor | Synonyms: flavorful, flavorous, flavorsome, flavourous, flavoursome, sapid, saporous |
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| flavouring | (noun) something added to food primarily for the savor it imparts | Synonyms: flavorer, flavoring, flavourer, seasoner, seasoning |
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| flavourless | (adjective) lacking taste or flavor or tang | Synonyms: bland, flat, flavorless, insipid, savorless, savourless, vapid |
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| flavourlessness | (noun) the property of having no flavor | Synonyms: flavorlessness, savorlessness, savourlessness, tastelessness |
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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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| flavoursomeness | (noun) having an appetizing flavor | Synonyms: flavorsomeness, savoriness |
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| flaw | (noun) an imperfection in an object or machine | Synonyms: defect, fault |
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| (noun) defect or weakness in a person's character | - |
| (noun) an imperfection in a plan or theory or legal document that causes it to fail or that reduces its effectiveness | - |
| (verb) add a flaw or blemish to; make imperfect or defective | Synonyms: blemish |
| flawed | (adjective) having a blemish or flaw | Synonyms: blemished |
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| flawless | (adjective) without a flaw | Synonyms: unflawed |
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| flawlessly | (adverb) smoothly and without difficulty; precisely and deftly | Synonyms: cleanly |
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| flawlessness | (noun) the state of being without a flaw or defect | Synonyms: ne plus ultra, perfection |
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| flax | (noun) plant of the genus Linum that is cultivated for its seeds and for the fibers of its stem | - |
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| (noun) fiber of the flax plant that is made into thread and woven into linen fabric | - |
| flaxen | (adjective) of hair color; pale yellowish to yellowish brown | Synonyms: sandy |
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| flaxseed | (noun) the seed of flax used as a source of oil | Synonyms: linseed |
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| flay | (verb) strip the skin off | - |
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| flea | (noun) any wingless bloodsucking parasitic insect noted for ability to leap | - |
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| fleabag | (noun) a run-down hotel | - |
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| fleabane | (noun) hairy perennial Eurasian herb with yellow daisylike flowers reputed to destroy or drive away fleas | Synonyms: feabane mullet, Pulicaria dysenterica |
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| (noun) any of several North American plants of the genus Erigeron having daisylike flowers; formerly believed to repel fleas | - |
| (noun) common North American weed with linear leaves and small discoid heads of yellowish flowers; widely naturalized throughout temperate regions; sometimes placed in genus Erigeron | Synonyms: Canadian fleabane, Conyza canadensis, Erigeron canadensis, horseweed |
| fleapit | (noun) an old shabby movie theater | - |
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| fleawort | (noun) plantain of Mediterranean regions whose seeds swell and become gelatinous when moist and are used as a mild laxative | Synonyms: Plantago psyllium, psyllium, Spanish psyllium |
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| flecainide | (noun) oral antiarrhythmic medication (trade name Tambocor) used as a last resort in treating arrhythmias; increases the risk of sudden death in heart attack patients | Synonyms: Tambocor |
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| fleck | (noun) a small contrasting part of something | Synonyms: dapple, maculation, patch, speckle, spot |
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| (noun) a small fragment of something broken off from the whole | Synonyms: bit, chip, flake, scrap |
| (verb) make a spot or mark onto | Synonyms: blob, blot, spot |
| flecked | (adjective) having a pattern of dots | Synonyms: dotted, specked, speckled, stippled |
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| flection | (noun) deviation from a straight or normal course | Synonyms: flexion, inflection |
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| (noun) the state of being flexed (as of a joint) | Synonyms: flexion, flexure |
| fledge | (verb) grow feathers | Synonyms: feather |
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| (verb) decorate with feathers | Synonyms: flight |
| (verb) feed, care for, and rear young birds for flight | - |
| fledged | (adjective) (of birds) having developed feathers or plumage; often used in combination | Synonyms: mature |
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| (adjective) (of an arrow) equipped with feathers | Synonyms: vaned |
| fledgeless | (adjective) (of an arrow) not equipped with feathers | Synonyms: unfledged, unvaned |
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| fledgeling | (adjective) (of a young bird) having acquired its flight feathers | Synonyms: fledgling |
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| (noun) young bird that has just fledged or become capable of flying | Synonyms: fledgling |
| (noun) any new participant in some activity | Synonyms: entrant, fledgling, freshman, neophyte, newbie, newcomer, starter |
| fledgling | (adjective) (of a young bird) having acquired its flight feathers | Synonyms: fledgeling |
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| (adjective) young and inexperienced | Synonyms: callow, unfledged |
| (noun) young bird that has just fledged or become capable of flying | Synonyms: fledgeling |
| (noun) any new participant in some activity | Synonyms: entrant, fledgeling, freshman, neophyte, newbie, newcomer, starter |
| flee | (verb) run away quickly | Synonyms: fly, take flight |
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| fleece | (noun) outer coat of especially sheep and yaks | Synonyms: wool |
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| (noun) a soft bulky fabric with deep pile; used chiefly for clothing | - |
| (noun) the wool of a sheep or similar animal | - |
| (noun) tanned skin of a sheep with the fleece left on; used for clothing | Synonyms: sheepskin |
| (verb) shear the wool from | Synonyms: shear |
| (verb) rip off; ask an unreasonable price | Synonyms: gazump, hook, overcharge, pluck, plume, rob, soak, surcharge |
| fleeceable | (adjective) naive and easily deceived or tricked | Synonyms: green, gullible |
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| fleecy | (adjective) (of fabrics) having soft nap produced by brushing | Synonyms: brushed, napped |
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| fleer | (noun) someone who flees from an uncongenial situation | Synonyms: fugitive, runaway |
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| (noun) contempt expressed by mockery in looks or words | - |
| (verb) to smirk contemptuously | - |
| fleet | (adjective) moving very fast | Synonyms: swift |
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| (noun) a group of warships organized as a tactical unit | - |
| (noun) a group of steamships operating together under the same ownership | - |
| (noun) group of motor vehicles operating together under the same ownership | - |
| (noun) group of aircraft operating together under the same ownership | - |
| (verb) disappear gradually | Synonyms: blow over, evanesce, fade, pass, pass off |
| (verb) move along rapidly and lightly; skim or dart | Synonyms: dart, flit, flutter |
| fleeting | (adjective) lasting for a markedly brief time | Synonyms: fugitive, momentaneous, momentary |
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| fleetingness | (noun) the property of lasting for a very short time | Synonyms: ephemerality, ephemeralness |
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| fleetly | (adverb) in a swift manner | Synonyms: swiftly |
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| fleetness | (noun) rapidity of movement | - |
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| flense | (verb) strip the blubber or skin from (a whale or seal) | - |
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| flerovium | (noun) a radioactive transuranic element | Synonyms: Fl |
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| flesh | (noun) alternative names for the body of a human being | Synonyms: anatomy, bod, build, chassis, figure, form, frame, human body, material body, physical body, physique, shape, soma |
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| (noun) the soft tissue of the body of a vertebrate: mainly muscle tissue and fat | - |
| (noun) a soft moist part of a fruit | Synonyms: pulp |
| (verb) remove adhering flesh from (hides) when preparing leather manufacture | - |
| fleshiness | (noun) more than average fatness | Synonyms: corpulency, obesity |
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| fleshly | (adjective) marked by the appetites and passions of the body | Synonyms: animal, carnal, sensual |
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| fleshy | (adjective) of or relating to or resembling flesh | Synonyms: sarcoid |
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| (adjective) usually describes a large person who is fat but has a large frame to carry it | Synonyms: heavy, overweight |
| flews | (noun) The fleshy hanging upper lip of a bloodhound or similar dog. | - |
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| flex | (noun) the act of flexing | - |
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| (verb) cause (an object) to assume a crooked or angular form | Synonyms: bend, deform, turn, twist |
| (verb) bend a joint | Synonyms: bend |
| (verb) form a curve | Synonyms: bend |
| (verb) contract | - |
| (verb) exhibit the strength of | - |
| flexibility | (noun) the quality of being adaptable or variable | Synonyms: flexibleness |
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| (noun) the property of being flexible; easily bent or shaped | Synonyms: flexibleness |
| (noun) the trait of being easily persuaded | Synonyms: tractability, tractableness |
| flexible | (adjective) able to flex; able to bend easily | Synonyms: flexile |
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| (adjective) capable of being changed | - |
| (adjective) making or willing to make concessions | Synonyms: compromising, conciliatory |
| (adjective) able to adjust readily to different conditions | Synonyms: elastic, pliable, pliant |
| (adjective) bending and snapping back readily without breaking | Synonyms: whippy |
| flexibleness | (noun) the property of being flexible; easily bent or shaped | Synonyms: flexibility |
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| (noun) the quality of being adaptable or variable | Synonyms: flexibility |
| flexibly | (adverb) with flexibility | - |
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| flexile | (adjective) able to flex; able to bend easily | Synonyms: flexible |
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| flexion | (noun) act of bending a joint; especially a joint between the bones of a limb so that the angle between them is decreased | Synonyms: flexure |
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| (noun) deviation from a straight or normal course | Synonyms: flection, inflection |
| (noun) the state of being flexed (as of a joint) | Synonyms: flection, flexure |
| flexitarianism | (noun) The practice of eating mainly vegetarian food, but making occasional exceptions for social, pragmatic, cultural, or nutritional reasons. | Synonyms: semi-vegetarianism |
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| flexor | (noun) a skeletal muscle whose contraction bends a joint | Synonyms: flexor muscle |
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| flexuous | (adjective) having turns or windings | - |
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| flexure | (noun) act of bending a joint; especially a joint between the bones of a limb so that the angle between them is decreased | Synonyms: flexion |
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| (noun) an angular or rounded shape made by folding | Synonyms: bend, crease, crimp, fold, plication |
| (noun) the state of being flexed (as of a joint) | Synonyms: flection, flexion |
| flibbertigibbet | (noun) a female fool | Synonyms: foolish woman |
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| flick | (noun) a form of entertainment that enacts a story by sound and a sequence of images giving the illusion of continuous movement | Synonyms: film, motion-picture show, motion picture, movie, moving-picture show, moving picture, pic, picture, picture show |
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| (noun) a short stroke | - |
| (noun) a light sharp contact (usually with something flexible) | - |
| (verb) remove with a flick (of the hand) | - |
| (verb) touch or hit with a light, quick blow | - |
| (verb) cause to make a snapping sound | Synonyms: click, snap |
| (verb) throw or toss with a quick motion | Synonyms: jerk |
| (verb) twitch or flutter | Synonyms: riffle, ruffle |
| (verb) cause to move with a flick | Synonyms: flip |
| (verb) flash intermittently | Synonyms: flicker |
| (verb) look through a book or other written material | Synonyms: flip, leaf, riff, riffle, thumb |
| (verb) shine unsteadily | Synonyms: flicker |
| flicker | (noun) the act of moving back and forth | Synonyms: flutter, waver |
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| (noun) North American woodpecker | - |
| (noun) a momentary flash of light | Synonyms: glint, spark |
| (verb) move back and forth very rapidly | Synonyms: flitter, flutter, quiver, waver |
| (verb) flash intermittently | Synonyms: flick |
| (verb) shine unsteadily | Synonyms: flick |
| flickering | (adjective) shining unsteadily | Synonyms: aflicker |
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| flickertail | (noun) of sagebrush and grassland areas of western United States and Canada | Synonyms: Citellus richardsoni, Richardson ground squirrel |
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| flier | (noun) an advertisement (usually printed on a page or in a leaflet) intended for wide distribution | Synonyms: bill, broadsheet, broadside, circular, flyer, handbill, throwaway |
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| (noun) someone who travels by air | Synonyms: flyer |
| (noun) someone who operates an aircraft | Synonyms: aeronaut, aviator, flyer |
| flies | (noun) (theater) the space over the stage (out of view of the audience) used to store scenery (drop curtains) | - |
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| flight | (noun) an instance of traveling by air | Synonyms: flying |
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| (noun) the act of escaping physically | Synonyms: escape |
| (noun) a scheduled trip by plane between designated airports | - |
| (noun) a stairway (set of steps) between one floor or landing and the next | Synonyms: flight of stairs, flight of steps |
| (noun) passing above and beyond ordinary bounds | - |
| (noun) an air force unit smaller than a squadron | - |
| (noun) a formation of aircraft in flight | - |
| (noun) a flock of flying birds | - |
| (noun) the path followed by an object moving through space | Synonyms: trajectory |
| (verb) decorate with feathers | Synonyms: fledge |
| (verb) fly in a flock | - |
| (verb) shoot a bird in flight | - |