| facultative | (adjective) able to exist under more than one set of conditions | - |
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| (adjective) of or relating to the mental faculties | - |
| (adjective) granting a privilege or permission or power to do or not do something | - |
| (adjective) optional | Synonyms: elective |
| fake | (adjective) not genuine or real; being an imitation of the genuine article | Synonyms: false, faux, imitation, simulated |
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| (adjective) fraudulent; having a misleading appearance | Synonyms: bastard, bogus, phoney, phony |
| falcate | (adjective) curved like a sickle | Synonyms: falciform, sickle-shaped |
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| falconine | (adjective) relating to or resembling a falcon | - |
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| fallible | (adjective) likely to fail or make errors | - |
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| (adjective) wanting in moral strength, courage, or will; having the attributes of man as opposed to e.g. divine beings | Synonyms: frail, imperfect, weak |
| false | (adjective) not in accordance with the fact or reality or actuality | - |
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| (adjective) not genuine or real; being an imitation of the genuine article | Synonyms: fake, faux, imitation, simulated |
| (adjective) adopted in order to deceive | Synonyms: assumed, fictitious, fictive, pretended, put on, sham |
| (adjective) designed to deceive | - |
| (adjective) (used especially of persons) not dependable in devotion or affection; unfaithful | Synonyms: untrue |
| (adjective) arising from error | Synonyms: mistaken |
| (adjective) inaccurate in pitch | Synonyms: off-key, sour |
| (adjective) deliberately deceptive | - |
| (adjective) erroneous and usually accidental | - |
| (adjective) inappropriate to reality or facts | Synonyms: delusive |
| falsifiable | (adjective) capable of being tested (verified or falsified) by experiment or observation | Synonyms: confirmable, verifiable |
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| fanlike | (adjective) resembling a fan | - |
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| fashionable | (adjective) being or in accordance with current social fashions | Synonyms: stylish |
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| (adjective) having elegance or taste or refinement in manners or dress | Synonyms: stylish |
| (adjective) popular and considered appealing or fashionable at the time | Synonyms: in fashion |
| fastigiate | (adjective) having clusters of erect branches (often appearing to form a single column) | - |
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| fatherlike | (adjective) like or befitting a father or fatherhood; kind and protective | Synonyms: fatherly |
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| fathomable | (adjective) (of depth) capable of being sounded or measured for depth | Synonyms: plumbable, soundable |
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| (adjective) (of meaning) capable of being penetrated or comprehended | - |
| faveolate | (adjective) pitted with cell-like cavities (as a honeycomb) | Synonyms: alveolate, cavitied, honeycombed, pitted |
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| favorable | (adjective) (of winds or weather) tending to promote or facilitate | Synonyms: favourable |
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| (adjective) encouraging or approving or pleasing | Synonyms: favourable |
| (adjective) giving an advantage | Synonyms: advantageous, favourable |
| (adjective) presaging or likely to bring good luck or a good outcome | Synonyms: favourable, golden, lucky, prosperous |
| favorite | (adjective) preferred above all others and treated with partiality | Synonyms: best-loved, favored, favoured, favourite, pet, preferent, preferred |
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| (adjective) appealing to the general public | Synonyms: favourite |
| favourable | (adjective) (of winds or weather) tending to promote or facilitate | Synonyms: favorable |
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| (adjective) encouraging or approving or pleasing | Synonyms: favorable |
| (adjective) giving an advantage | Synonyms: advantageous, favorable |
| (adjective) presaging or likely to bring good luck or a good outcome | Synonyms: favorable, golden, lucky, prosperous |
| favourite | (adjective) preferred above all others and treated with partiality | Synonyms: best-loved, favored, favorite, favoured, pet, preferent, preferred |
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| (adjective) appealing to the general public | Synonyms: favorite |
| fearsome | (adjective) causing fear or dread or terror | Synonyms: awful, dire, direful, dread, dreaded, dreadful, fearful, frightening, horrendous, horrific, terrible |
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| feasible | (adjective) capable of being done with means at hand and circumstances as they are | Synonyms: executable, practicable, viable, workable |
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| featherlike | (adjective) resembling or suggesting a feather or feathers | Synonyms: feathery |
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| febrile | (adjective) of or relating to or characterized by fever | Synonyms: feverish |
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| federate | (adjective) united under a central government | Synonyms: federated |
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| feeble | (adjective) lacking bodily or muscular strength or vitality | Synonyms: debile, decrepit, infirm, rickety, sapless, weak, weakly |
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| (adjective) lacking strength | Synonyms: nerveless |
| (adjective) lacking strength or vigor | Synonyms: faint |
| (adjective) pathetically lacking in force or effectiveness | Synonyms: lame |
| feline | (adjective) of or relating to cats | - |
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| female | (adjective) being the sex (of plant or animal) that produces fertilizable gametes (ova) from which offspring develop | - |
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| (adjective) for or pertaining to or composed of women or girls | - |
| (adjective) characteristic of or peculiar to a woman | Synonyms: distaff |
| feminine | (adjective) associated with women and not with men | - |
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| (adjective) female (of grammatical gender) | - |
| (adjective) befitting or characteristic of a woman especially a mature woman | Synonyms: womanly |
| (adjective) (music or poetry) ending on an unaccented beat or syllable | - |
| fencelike | (adjective) resembling a fence | - |
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| ferine | (adjective) wild and menacing | Synonyms: feral, savage |
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| fermentable | (adjective) capable of being fermented | - |
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| fernlike | (adjective) resembling ferns especially in leaf shape | Synonyms: ferny |
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| fertile | (adjective) capable of reproducing | - |
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| (adjective) marked by great fruitfulness | Synonyms: fat, productive, rich |
| (adjective) bearing in abundance especially offspring | Synonyms: prolific |
| (adjective) intellectually productive | Synonyms: fecund, prolific |
| fertilizable | (adjective) capable of being fertilized | - |
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| festive | (adjective) offering fun and gaiety | Synonyms: festal, gay, merry |
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| fibrillose | (adjective) covered with fibrils more or less evenly disposed | - |
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| fickle | (adjective) liable to sudden unpredictable change | Synonyms: erratic, mercurial, quicksilver |
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| (adjective) marked by erratic changeableness in affections or attachments | Synonyms: volatile |
| fictile | (adjective) of or relating to the craft of pottery | - |
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| (adjective) capable of being molded or modeled (especially of earth or clay or other soft material) | Synonyms: moldable, plastic |
| (adjective) susceptible to being led or directed | Synonyms: pliable |
| fictive | (adjective) adopted in order to deceive | Synonyms: assumed, false, fictitious, pretended, put on, sham |
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| (adjective) capable of imaginative creation | - |
| fierce | (adjective) marked by extreme intensity of emotions or convictions; inclined to react violently; fervid | Synonyms: tearing, trigger-happy, vehement, violent |
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| (adjective) ruthless in competition | Synonyms: bowelless, cutthroat |
| (adjective) violently agitated and turbulent | Synonyms: boisterous, rough |
| (adjective) marked by extreme and violent energy | Synonyms: ferocious, furious, savage |
| figurative | (adjective) (used of the meanings of words or text) not literal; using figures of speech | Synonyms: nonliteral |
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| (adjective) consisting of or forming human or animal figures | Synonyms: figural |
| filamentlike | (adjective) thin in diameter; resembling a thread | Synonyms: filamentous, filiform, threadlike, thready |
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| filmable | (adjective) (used of a story or literary work) capable of being adapted to motion picture form | - |
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| fimbriate | (adjective) having a fringe of slender processes | - |
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| finable | (adjective) liable to a fine | Synonyms: fineable |
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| fine | (adjective) of textures that are smooth to the touch or substances consisting of relatively small particles | - |
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| (adjective) characterized by elegance or refinement or accomplishment | - |
| (adjective) minutely precise especially in differences in meaning | - |
| (adjective) free from impurities; having a high or specified degree of purity | - |
| (adjective) being satisfactory or in satisfactory condition | Synonyms: all right, cool, hunky-dory, o.k., ok, okay |
| (adjective) thin in thickness or diameter | - |
| fineable | (adjective) liable to a fine | Synonyms: finable |
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| fingerlike | (adjective) resembling a finger | Synonyms: digitate |
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| finite | (adjective) bounded or limited in magnitude or spatial or temporal extent | - |
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| (adjective) (of verbs) relating to forms of the verb that are limited in time by a tense and (usually) show agreement with number and person | - |
| fisheye | (adjective) of or relating to a fisheye lens | Synonyms: wide-angle |
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| fissile | (adjective) capable of being split or cleft or divided in the direction of the grain | - |
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| (adjective) capable of undergoing nuclear fission | Synonyms: fissionable |
| fissionable | (adjective) capable of undergoing nuclear fission | Synonyms: fissile |
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| fistulate | (adjective) hollow and tube-shaped like a reed | Synonyms: fistular, fistulous |
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| five | (adjective) being one more than four | Synonyms: 5, v |
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| flagellate | (adjective) having or resembling a lash or whip (as does a flagellum) | Synonyms: flagellated, lash-like, whiplike |
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| flammable | (adjective) easily ignited | Synonyms: inflammable |
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| flavorsome | (adjective) full of flavor | Synonyms: flavorful, flavorous, flavourful, flavourous, flavoursome, sapid, saporous |
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| flavoursome | (adjective) full of flavor | Synonyms: flavorful, flavorous, flavorsome, flavourful, flavourous, sapid, saporous |
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| fleeceable | (adjective) naive and easily deceived or tricked | Synonyms: green, gullible |
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| 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 |
| flexile | (adjective) able to flex; able to bend easily | Synonyms: flexible |
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| floccose | (adjective) (of plants) having tufts of soft woolly hairs | - |
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| foldable | (adjective) capable of being folded up and stored | Synonyms: foldaway, folding |
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| foliate | (adjective) ornamented with foliage or foils | Synonyms: foliated |
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| (adjective) (often used as a combining form) having or resembling a leaf or having a specified kind or number of leaves | - |
| (adjective) (especially of metamorphic rock) having thin leaflike layers or strata | Synonyms: foliaceous, foliated |
| foliolate | (adjective) (often used as a combining form) having leaflets (compound leaves) or a specified kind or number of leaflets | - |
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| foliose | (adjective) bearing numerous leaves | Synonyms: foliaceous, foliaged |
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| footloose | (adjective) free to go or do as one pleases | - |
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| footsore | (adjective) having sore or tired feet | - |
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| footsure | (adjective) not liable to stumble or fall | Synonyms: sure-footed, surefooted |
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| forcible | (adjective) impelled by physical force especially against resistance | Synonyms: physical, strong-arm |
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| forcipate | (adjective) shaped like a forceps; deeply forked | - |
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| fordable | (adjective) shallow enough to be crossed by walking or riding on an animal or in a vehicle | - |
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| fore | (adjective) situated at or toward the bow of a vessel | - |
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| foregone | (adjective) well in the past; former | Synonyms: bygone, bypast, departed, gone |
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| foreseeable | (adjective) capable of being anticipated | - |
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| forficate | (adjective) resembling a fork; divided or separated into two branches | Synonyms: bifurcate, biramous, branched, fork-like, forked, pronged, prongy |
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| forgettable | (adjective) easily forgotten | - |
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| forgivable | (adjective) easily excused or forgiven | Synonyms: excusable, venial |
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| formative | (adjective) forming or capable of forming or molding or fashioning | Synonyms: plastic, shaping |
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| (adjective) capable of forming new cells and tissues | - |
| formidable | (adjective) inspiring fear | Synonyms: redoubtable, unnerving |
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| (adjective) extremely impressive in strength or excellence | - |
| forte | (adjective) (used chiefly as a direction or description in music) indicating that said piece or segment should be played loudly | Synonyms: loud |
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| fortemente | (adjective) (chiefly a direction or description in music) loud and strong | - |
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| fortunate | (adjective) having unexpected good fortune | - |
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| (adjective) presaging good fortune | Synonyms: rosy |
| (adjective) supremely favored | Synonyms: golden |
| fourscore | (adjective) being ten more than seventy | Synonyms: 80, eighty, lxxx |
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| foursquare | (adjective) characterized by firm and unwavering conviction | - |
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| fragile | (adjective) easily broken or damaged or destroyed | Synonyms: delicate, frail |
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| (adjective) vulnerably delicate | - |
| (adjective) lacking substance or significance | Synonyms: flimsy, slight, tenuous, thin |
| frangible | (adjective) capable of being broken | - |
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| free | (adjective) not limited or hampered; not under compulsion or restraint | - |
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| (adjective) not held in servitude | - |
| (adjective) unconstrained or not chemically bound in a molecule or not fixed and capable of relatively unrestricted motion | - |
| (adjective) not literal | Synonyms: liberal, loose |
| (adjective) completely wanting or lacking | Synonyms: barren, destitute, devoid, innocent |
| (adjective) not fixed in position | Synonyms: detached |
| (adjective) costing nothing | Synonyms: complimentary, costless, gratis, gratuitous |
| (adjective) not taken up by scheduled activities | Synonyms: spare |
| (adjective) not occupied or in use | - |
| freelance | (adjective) working for yourself | Synonyms: free-lance, self-employed |
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| (adjective) serving for wages in a foreign army | Synonyms: free-lance, mercenary |
| friable | (adjective) easily broken into small fragments or reduced to powder | Synonyms: crumbly |
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| fricative | (adjective) of speech sounds produced by forcing air through a constricted passage (as `f', `s', `z', or `th' in both `thin' and `then') | Synonyms: continuant, sibilant, spirant, strident |
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| frolicsome | (adjective) given to merry frolicking | Synonyms: coltish, frolicky, rollicking, sportive |
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| frore | (adjective) very cold | - |
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| frustrative | (adjective) preventing realization or attainment of a desire | Synonyms: frustrating, thwarting |
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| fruticose | (adjective) of or relating to or resembling a shrub | Synonyms: fruticulose, shrubby |
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| fruticulose | (adjective) of or relating to or resembling a shrub | Synonyms: fruticose, shrubby |
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| fugitive | (adjective) lasting for a markedly brief time | Synonyms: fleeting, momentaneous, momentary |
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| fulsome | (adjective) unpleasantly and excessively suave or ingratiating in manner or speech | Synonyms: buttery, oily, oleaginous, smarmy, soapy, unctuous |
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| fungible | (adjective) of goods or commodities; freely exchangeable for or replaceable by another of like nature or kind in the satisfaction of an obligation | - |
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| funguslike | (adjective) resembling fungi | Synonyms: fungoid |
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| furlike | (adjective) resembling fur | - |
|---|
| furtive | (adjective) marked by quiet and caution and secrecy; taking pains to avoid being observed | Synonyms: sneak, sneaky, stealthy, surreptitious |
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| (adjective) secret and sly or sordid | Synonyms: backstair, backstairs |