| 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 |
| fiberoptic | (adjective) of or relating to fiber optics | Synonyms: fiber-optic, fibre-optic, fibreoptic |
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| fibreoptic | (adjective) of or relating to fiber optics | Synonyms: fiber-optic, fiberoptic, fibre-optic |
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| fibrillose | (adjective) covered with fibrils more or less evenly disposed | - |
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| fibrinous | (adjective) characterized by the presence of fibrin | - |
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| fibrocalcific | (adjective) involving or resulting from calcification of fibrous tissue | - |
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| fibrocartilaginous | (adjective) of or relating to fibrocartilage | - |
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| fibrous | (adjective) (of meat) full of sinews; especially impossible to chew | Synonyms: sinewy, stringy, unchewable |
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| (adjective) having or resembling fibers especially fibers used in making cordage such as those of jute | Synonyms: hempen |
| 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 |
| fictional | (adjective) related to or involving literary fiction | - |
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| (adjective) formed or conceived by the imagination | Synonyms: fabricated, fancied, fictitious |
| fictitious | (adjective) adopted in order to deceive | Synonyms: assumed, false, fictive, pretended, put on, sham |
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| (adjective) formed or conceived by the imagination | Synonyms: fabricated, fancied, fictional |
| fictive | (adjective) adopted in order to deceive | Synonyms: assumed, false, fictitious, pretended, put on, sham |
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| (adjective) capable of imaginative creation | - |
| fiddling | (adjective) (informal) small and of little importance | Synonyms: footling, lilliputian, little, niggling, petty, picayune, piddling, piffling, trivial |
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| fidgety | (adjective) nervous and unable to relax | Synonyms: antsy, fretful, itchy, restless |
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| fiducial | (adjective) relating to or of the nature of a legal trust (i.e. the holding of something in trust for another) | Synonyms: fiduciary |
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| (adjective) used as a fixed standard of reference for comparison or measurement | - |
| (adjective) based on trust | - |
| fiduciary | (adjective) relating to or of the nature of a legal trust (i.e. the holding of something in trust for another) | Synonyms: fiducial |
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| fiendish | (adjective) extremely evil or cruel; expressive of cruelty or befitting hell | Synonyms: demonic, diabolic, diabolical, hellish, infernal, satanic, unholy |
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| 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 |
| fiery | (adjective) like or suggestive of fire | Synonyms: igneous |
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| (adjective) passionate or quick-tempered | Synonyms: flaming |
| (adjective) characterized by intense emotion | Synonyms: ardent, fervent, fervid, impassioned, perfervid, torrid |
| fifteen | (adjective) being one more than fourteen | Synonyms: 15, xv |
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| fifteenth | (adjective) coming next after the fourteenth and just before the sixteenth in position | Synonyms: 15th |
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| fifth | (adjective) coming next after the fourth and just before the sixth in position | Synonyms: 5th |
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| fiftieth | (adjective) the ordinal number of fifty in counting order | Synonyms: 50th |
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| fifty | (adjective) being ten more than forty | Synonyms: 50, l |
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| fighting | (adjective) engaged in or ready for military or naval operations | Synonyms: active, combat-ready |
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| figural | (adjective) consisting of or forming human or animal figures | Synonyms: figurative |
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| 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 |
| figured | (adjective) (of e.g. fabric design) adorned with patterns | - |
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| filamentlike | (adjective) thin in diameter; resembling a thread | Synonyms: filamentous, filiform, threadlike, thready |
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| filamentous | (adjective) thin in diameter; resembling a thread | Synonyms: filamentlike, filiform, threadlike, thready |
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| filar | (adjective) related to or having filaments (especially across a field of view as in the eyepiece of a telescope) | - |
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| filarial | (adjective) related to or infested with or transmitting parasitic worms especially filaria | - |
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| filariid | (adjective) of or relating to or belonging to the family Filariidae | - |
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| filial | (adjective) relating to or characteristic of or befitting an offspring | - |
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| (adjective) designating the generation or the sequence of generations following the parental generation | - |
| filiform | (adjective) thin in diameter; resembling a thread | Synonyms: filamentlike, filamentous, threadlike, thready |
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| filled | (adjective) of purchase orders that have been filled | - |
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| (adjective) (of time) taken up | - |
| (adjective) (usually followed by `with' or used as a combining form) generously supplied with | - |
| filmable | (adjective) (used of a story or literary work) capable of being adapted to motion picture form | - |
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| filmed | (adjective) recorded on film; made into a movie | - |
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| filmy | (adjective) so thin as to transmit light | Synonyms: cobwebby, diaphanous, gauze-like, gauzy, gossamer, see-through, sheer, transparent, vaporous, vapourous |
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| filthy | (adjective) disgustingly dirty; filled or smeared with offensive matter | Synonyms: foul, nasty |
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| (adjective) characterized by obscenity | Synonyms: cruddy, foul, nasty, smutty |
| (adjective) vile; despicable | Synonyms: dirty, lousy |
| fimbriate | (adjective) having a fringe of slender processes | - |
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| finable | (adjective) liable to a fine | Synonyms: fineable |
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| final | (adjective) occurring at or forming an end or termination | Synonyms: concluding, last, terminal |
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| (adjective) conclusive in a process or progression | Synonyms: last, net |
| (adjective) not to be altered or undone | Synonyms: last |
| financial | (adjective) involving financial matters | Synonyms: fiscal |
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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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| finer | (adjective) (comparative of `fine') greater in quality or excellence | - |
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| finespun | (adjective) developed in excessively fine detail | Synonyms: hairsplitting |
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| (adjective) developed with extreme delicacy and subtlety | Synonyms: delicate |
| fingered | (adjective) having or resembling a finger or fingers; often used in combination | - |
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