| featherless | (adjective) having no feathers | Synonyms: unfeathered |
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| featureless | (adjective) lacking distinguishing characteristics or features | - |
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| featurelessness | (noun) The state or condition of being without distinguishing features. | - |
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| feckless | (adjective) generally incompetent and ineffectual | Synonyms: inept |
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| (adjective) not fit to assume responsibility | - |
| fecklessness | (noun) worthlessness due to being feeble and ineffectual | - |
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| feeblemindedness | (noun) severe mental deficiency | - |
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| feebleness | (noun) the quality of lacking intensity or substance | Synonyms: tenuity |
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| (noun) the state of being weak in health or body (especially from old age) | Synonyms: debility, frailness, frailty, infirmity, valetudinarianism |
| feistiness | (noun) The quality or state of being tenacious, energetic, spunky. | Synonyms: scrappiness |
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| felicitousness | (noun) pleasing and appropriate manner or style (especially manner or style of expression) | Synonyms: felicity |
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| feloniousness | (noun) The property of relating to, or having the nature of a serious criminal offense. | - |
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| femaleness | (noun) the properties characteristic of the female sex | Synonyms: feminineness |
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| feminineness | (noun) the properties characteristic of the female sex | Synonyms: femaleness |
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| fernless | (adjective) devoid of ferns | - |
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| ferociousness | (noun) the trait of extreme cruelty | Synonyms: brutality, savagery, viciousness |
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| fervidness | (noun) feelings of great warmth and intensity | Synonyms: ardor, ardour, fervency, fervor, fervour, fire |
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| fess | (noun) (heraldry) an ordinary consisting of a broad horizontal band across a shield | Synonyms: fesse |
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| fetidness | (noun) the attribute of having a strong offensive smell | Synonyms: foulness, malodorousness, rankness, stinkiness |
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| feverishness | (noun) a rise in the temperature of the body; frequently a symptom of infection | Synonyms: febricity, febrility, fever, pyrexia |
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| (noun) A state of wildly excited activity or emotion. | - |
| fewness | (noun) the quality of being small in number | - |
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| fibrousness | (noun) the quality of being fibrous | Synonyms: fibrosity |
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| fickleness | (noun) unfaithfulness by virtue of being unreliable or treacherous | Synonyms: faithlessness, falseness, inconstancy |
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| fidgetiness | (noun) a feeling of agitation expressed in continual motion | Synonyms: fidget, restlessness |
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| fierceness | (noun) the property of being wild or turbulent | Synonyms: ferocity, furiousness, fury, vehemence, violence, wildness |
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| fieriness | (noun) the heat or the color of fire | Synonyms: red heat |
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| (noun) a passionate and quick-tempered nature | - |
| figurativeness | (noun) The property of being metaphorical or tropical, as opposed to literal; using figures of speech. | - |
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| (noun) The representation of form or figure in art. | - |
| filthiness | (noun) moral corruption or pollution | - |
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| (noun) a state characterized by foul or disgusting dirt and refuse | Synonyms: filth, foulness, nastiness |
| fineness | (noun) the quality of being beautiful and delicate in appearance | Synonyms: daintiness, delicacy |
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| (noun) the property of being very narrow or thin | Synonyms: thinness |
| (noun) having a very fine texture | Synonyms: powderiness |
| (noun) the quality of being very good indeed | Synonyms: choiceness |
| fingerless | (adjective) not having or having lost fingers | - |
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| finiteness | (noun) the quality of being finite | Synonyms: boundedness, finitude |
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| firmness | (noun) the quality of being steady or securely and immovably fixed in place | Synonyms: steadiness |
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| (noun) the trait of being resolute | Synonyms: firmness of purpose, resoluteness, resolution, resolve |
| (noun) the property of being unyielding to the touch | - |
| (noun) the muscle tone of healthy tissue | Synonyms: soundness |
| fitfulness | (noun) the quality of being spasmodic and irregular | Synonyms: jerkiness |
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| fitness | (noun) the quality of being suitable | Synonyms: fittingness |
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| (noun) the quality of being qualified | - |
| (noun) good physical condition; being in shape or in condition | Synonyms: physical fitness |
| fittingness | (noun) the quality of being suitable | Synonyms: fitness |
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| fixedness | (noun) the quality of being fixed in place as by some firm attachment | Synonyms: fastness, fixity, fixture, secureness |
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| (noun) the quality of being fixed and unchangeable | Synonyms: unalterability |
| (noun) remaining in place | Synonyms: immobility, stationariness |
| flabbiness | (noun) a flabby softness | Synonyms: flaccidity, limpness |
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| flakiness | (noun) having or breaking into thin crisp flakes | - |
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| (noun) informal terms for insanity | Synonyms: craziness, daftness |
| flashiness | (noun) tasteless showiness | Synonyms: brashness, garishness, gaudiness, glitz, loudness, meretriciousness, tawdriness |
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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 | - |
| 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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| flavorsomeness | (noun) having an appetizing flavor | Synonyms: flavoursomeness, savoriness |
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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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| flavoursomeness | (noun) having an appetizing flavor | Synonyms: flavorsomeness, savoriness |
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| flawless | (adjective) without a flaw | Synonyms: unflawed |
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| flawlessness | (noun) the state of being without a flaw or defect | Synonyms: ne plus ultra, perfection |
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| fledgeless | (adjective) (of an arrow) not equipped with feathers | Synonyms: unfledged, unvaned |
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| fleetingness | (noun) the property of lasting for a very short time | Synonyms: ephemerality, ephemeralness |
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| fleetness | (noun) rapidity of movement | - |
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| fleshiness | (noun) more than average fatness | Synonyms: corpulency, obesity |
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| 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 |
| flightiness | (noun) the trait of acting unpredictably and more from whim or caprice than from reason or judgment | Synonyms: arbitrariness, capriciousness, whimsey, whimsicality, whimsy |
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| flightless | (adjective) incapable of flying | - |
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| flightlessness | (noun) The condition of being unable to fly, usually used with birds such as the penguin, ostrich, and emu. | - |
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| flimsiness | (noun) the property of weakness by virtue of careless construction | Synonyms: shoddiness |
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| floridness | (noun) extravagant elaborateness | Synonyms: flamboyance, floridity, showiness |
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| flouriness | (noun) The state or condition of resembling flour, of being a fine soft powder. | - |
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| flowerless | (adjective) without flower or bloom and not producing seeds | Synonyms: nonflowering |
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| fluffiness | (noun) a light softness | Synonyms: downiness, featheriness |
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| fluidness | (noun) the property of flowing easily | Synonyms: fluidity, liquidity, liquidness, runniness |
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| (noun) a changeable quality | Synonyms: fluidity |
| foaminess | (noun) the property of being foamy | - |
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| fogginess | (noun) the quality of being indistinct and without sharp outlines | Synonyms: blurriness, fuzziness, indistinctness, softness |
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| (noun) an atmosphere in which visibility is reduced because of a cloud of some substance | Synonyms: fog, murk, murkiness |
| fondness | (noun) a quality proceeding from feelings of affection or love | Synonyms: affectionateness, lovingness, warmth |
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| (noun) a positive feeling of liking | Synonyms: affection, affectionateness, heart, philia, tenderness, warmheartedness, warmness |
| (noun) a predisposition to like something | Synonyms: fancy, partiality |
| foodless | (adjective) being without food | - |
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| foolhardiness | (noun) the trait of giving little thought to danger | Synonyms: rashness, recklessness |
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| foolishness | (noun) a stupid mistake | Synonyms: betise, folly, imbecility, stupidity |
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| (noun) the trait of acting stupidly or rashly | Synonyms: folly, unwiseness |
| (noun) the quality of being rash and foolish | Synonyms: craziness, folly, madness |
| footedness | (noun) the property of favoring one foot over the other (as in kicking a ball) | - |
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| footless | (adjective) having no feet or analogous appendages | - |
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| foppishness | (noun) the manner and dress of a fop or dandy | Synonyms: dandyism |
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| forcefulness | (noun) physical energy or intensity | Synonyms: force, strength |
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| forceless | (adjective) lacking force; feeble | Synonyms: unforceful |
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| foreignness | (noun) the quality of being alien or not native | Synonyms: curiousness, strangeness |
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| foresightedness | (noun) providence by virtue of planning prudently for the future | Synonyms: foresight, foresightfulness |
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| foresightfulness | (noun) providence by virtue of planning prudently for the future | Synonyms: foresight, foresightedness |
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| forgetfulness | (noun) tendency to forget | - |
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| (noun) unawareness caused by neglectful or heedless failure to remember | - |
| forgiveness | (noun) the act of excusing a mistake or offense | Synonyms: pardon |
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| (noun) compassionate feelings that support a willingness to forgive | - |
| forgivingness | (noun) tendency to be kind and forgiving | Synonyms: kindness |
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| forlornness | (noun) sadness resulting from being forsaken or abandoned | Synonyms: desolation, loneliness |
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| formalness | (noun) a manner that strictly observes all forms and ceremonies | Synonyms: formality |
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| formless | (adjective) having no physical form | - |
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| (adjective) having no definite form or distinct shape | Synonyms: amorphous, shapeless |
| fornicatress | (noun) a woman adulterer | Synonyms: adulteress, hussy, jade, loose woman, slut, strumpet, trollop |
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| forthcomingness | (noun) the state of being imminent and liable to happen soon | Synonyms: imminence, imminency, imminentness, impendence, impendency |
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| forthrightness | (noun) the quality of being honest and straightforward in attitude and speech | Synonyms: candidness, candor, candour, directness, frankness |
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| fortress | (noun) a fortified defensive structure | Synonyms: fort |
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| fortuitousness | (noun) the quality of happening accidentally and by lucky chance | - |
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| forwardness | (noun) prompt willingness | Synonyms: eagerness, readiness, zeal |
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| (noun) an advanced stage | - |
| (noun) offensive boldness and assertiveness | Synonyms: bumptiousness, cockiness, pushiness |
| foulness | (noun) the attribute of having a strong offensive smell | Synonyms: fetidness, malodorousness, rankness, stinkiness |
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| (noun) (of weather) the badness of the weather | Synonyms: raininess |
| (noun) a state characterized by foul or disgusting dirt and refuse | Synonyms: filth, filthiness, nastiness |
| (noun) disgusting wickedness and immorality | - |
| foundress | (noun) a woman founder | - |
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| foxiness | (noun) shrewdness as demonstrated by being skilled in deception | Synonyms: craft, craftiness, cunning, guile, slyness, wiliness |
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| fractiousness | (noun) the trait of being prone to disobedience and lack of discipline | Synonyms: unruliness, wilfulness, willfulness |
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| frailness | (noun) the state of being weak in health or body (especially from old age) | Synonyms: debility, feebleness, frailty, infirmity, valetudinarianism |
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| frangibleness | (noun) quality of being easily damaged or destroyed | Synonyms: breakability, fragility, frangibility |
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| frankness | (noun) the quality of being honest and straightforward in attitude and speech | Synonyms: candidness, candor, candour, directness, forthrightness |
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| (noun) the trait of being blunt and outspoken | Synonyms: outspokenness |
| freakishness | (noun) marked strangeness as a consequence of being abnormal | Synonyms: abnormality |
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| freshness | (noun) originality by virtue of being refreshingly novel | Synonyms: novelty |
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| (noun) the property of being pure and fresh (as if newly made); not stale or deteriorated | - |
| (noun) the trait of being rude and impertinent; inclined to take liberties | Synonyms: cheekiness, crust, gall, impertinence, impudence, insolence |
| (noun) originality by virtue of being new and surprising | Synonyms: novelty |
| (noun) an alert and refreshed state | Synonyms: glow |
| fress | (verb) eat a lot and without restraint | Synonyms: gluttonise, gluttonize |
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| fretfulness | (noun) an irritable petulant feeling | Synonyms: choler, crossness, fussiness, irritability, peevishness, petulance |
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| fricativeness | (noun) (phonetics) The quality of being produced by air flowing through a constriction in the oral cavity and typically producing a sibilant, hissing, or buzzing quality, as the English /f/ and /s/. | - |
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| frictionless | (adjective) lacking all friction | - |
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| friendless | (adjective) excluded from a society | Synonyms: outcast |
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