| fearful | (adjective) lacking courage; ignobly timid and faint-hearted | Synonyms: cowardly |
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| (adjective) experiencing or showing fear | - |
| (adjective) causing fear or dread or terror | Synonyms: awful, dire, direful, dread, dreaded, dreadful, fearsome, frightening, horrendous, horrific, terrible |
| (adjective) extremely distressing | Synonyms: frightful |
| (adjective) timid by nature or revealing timidity | Synonyms: timorous, trepid |
| fearless | (adjective) oblivious of dangers or perils or calmly resolute in facing them | Synonyms: unafraid |
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| (adjective) invulnerable to fear or intimidation | Synonyms: audacious, brave, dauntless, hardy, intrepid, unfearing |
| 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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| featherbrained | (adjective) lacking seriousness; given to frivolity | Synonyms: airheaded, dizzy, empty-headed, giddy, light-headed, lightheaded, silly |
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| feathered | (adjective) having or covered with feathers | - |
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| (adjective) adorned with feathers or plumes | Synonyms: feathery, plumy |
| featheredged | (adjective) having a rough edge; used of handmade paper or paper resembling handmade | Synonyms: deckle-edged, deckled |
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| featherless | (adjective) having no feathers | Synonyms: unfeathered |
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| featherlike | (adjective) resembling or suggesting a feather or feathers | Synonyms: feathery |
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| feathery | (adjective) adorned with feathers or plumes | Synonyms: feathered, plumy |
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| (adjective) characterized by a covering of feathers | - |
| (adjective) resembling or suggesting a feather or feathers | Synonyms: featherlike |
| featured | (adjective) made a feature or highlight; given prominence | - |
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| (adjective) having facial features as specified; usually used in combination | - |
| featureless | (adjective) lacking distinguishing characteristics or features | - |
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| febrile | (adjective) of or relating to or characterized by fever | Synonyms: feverish |
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| fecal | (adjective) of or relating to feces | Synonyms: faecal |
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| feckless | (adjective) generally incompetent and ineffectual | Synonyms: inept |
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| (adjective) not fit to assume responsibility | - |
| feculent | (adjective) foul with waste matter | - |
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| fecund | (adjective) capable of producing offspring or vegetation | - |
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| (adjective) intellectually productive | Synonyms: fertile, prolific |
| federal | (adjective) characterized by or constituting a form of government in which power is divided between one central and several regional authorities | - |
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| (adjective) of or relating to the central government of a federation | - |
| (adjective) national; especially in reference to the government of the United States as distinct from that of its member units | - |
| federate | (adjective) united under a central government | Synonyms: federated |
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| federated | (adjective) united under a central government | Synonyms: federate |
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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 |
| feebleminded | (adjective) retarded in intellectual development | Synonyms: backward, half-witted, slow-witted |
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| feigned | (adjective) not genuine | - |
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| feisty | (adjective) quick to take offense | Synonyms: huffy, thin-skinned, touchy |
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| (adjective) showing courage | Synonyms: plucky, spunky |
| felicitous | (adjective) exhibiting an agreeably appropriate manner or style | - |
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| (adjective) marked by good fortune | Synonyms: happy |
| feline | (adjective) of or relating to cats | - |
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| fell | (adjective) (of persons or their actions) able or disposed to inflict pain or suffering | Synonyms: barbarous, brutal, cruel, roughshod, savage, vicious |
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| felonious | (adjective) involving or being or having the nature of a crime | Synonyms: criminal |
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| felted | (adjective) made by combining fibers with a binder using heat and pressure | - |
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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 | - |
| feminist | (adjective) of or relating to or advocating equal rights for women | - |
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| femoral | (adjective) of or relating to or near the femur or thigh | - |
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| fencelike | (adjective) resembling a fence | - |
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| fenestral | (adjective) of or relating to windows | - |
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| (adjective) of or relating to or having a fenestra | - |
| feral | (adjective) wild and menacing | Synonyms: ferine, savage |
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| ferial | (adjective) of or relating to or being a feria | - |
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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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| ferned | (adjective) abounding in or covered with ferns | Synonyms: ferny |
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| fernless | (adjective) devoid of ferns | - |
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| fernlike | (adjective) resembling ferns especially in leaf shape | Synonyms: ferny |
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| ferny | (adjective) abounding in or covered with ferns | Synonyms: ferned |
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| (adjective) resembling ferns especially in leaf shape | Synonyms: fernlike |
| ferocious | (adjective) marked by extreme and violent energy | Synonyms: fierce, furious, savage |
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| ferric | (adjective) of or relating to or containing iron | Synonyms: ferrous |
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| ferromagnetic | (adjective) relating to or demonstrating ferromagnetism | - |
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| ferrous | (adjective) of or relating to or containing iron | Synonyms: ferric |
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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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| fervent | (adjective) (archaic) extremely hot, burning, or glowing | Synonyms: fervid |
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| (adjective) characterized by intense emotion | Synonyms: ardent, fervid, fiery, impassioned, perfervid, torrid |
| fervid | (adjective) (archaic) extremely hot, burning, or glowing | Synonyms: fervent |
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| (adjective) characterized by intense emotion | Synonyms: ardent, fervent, fiery, impassioned, perfervid, torrid |
| festal | (adjective) offering fun and gaiety | Synonyms: festive, gay, merry |
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| festive | (adjective) offering fun and gaiety | Synonyms: festal, gay, merry |
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| fetal | (adjective) of or relating to a fetus | Synonyms: foetal |
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| fetching | (adjective) very attractive; capturing interest | Synonyms: taking, winning |
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| fetid | (adjective) offensively malodorous | Synonyms: foetid, foul-smelling, foul, funky, ill-scented, noisome, smelly, stinking |
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| fettered | (adjective) bound by chains fastened around the ankles | Synonyms: shackled |
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| feudal | (adjective) of or relating to or characteristic of feudalism | Synonyms: feudalistic |
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| feudalistic | (adjective) of or relating to or characteristic of feudalism | Synonyms: feudal |
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| feudatory | (adjective) of or pertaining to the relation of a feudal vassal to his lord | - |
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| (adjective) owing feudal allegiance to or being subject to a sovereign | - |
| fevered | (adjective) highly or nervously excited | - |
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| feverish | (adjective) of or relating to or characterized by fever | Synonyms: febrile |
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| (adjective) marked by intense agitation or emotion | Synonyms: hectic |
| (adjective) having or affected by a fever | Synonyms: feverous |
| feverous | (adjective) having or affected by a fever | Synonyms: feverish |
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| few | (adjective) a quantifier that can be used with count nouns and is often preceded by `a'; a small but indefinite number | - |
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| fewer | (adjective) (comparative of `few' used with count nouns) quantifier meaning a smaller number of | - |
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| fewest | (adjective) (superlative of `few' used with count nouns and usually preceded by `the') quantifier meaning the smallest in number | - |
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| fey | (adjective) slightly insane | Synonyms: touched |
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| (adjective) suggestive of an elf in strangeness and otherworldliness | Synonyms: elfin |