| 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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| fingerless | (adjective) not having or having lost fingers | - |
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| fingerlike | (adjective) resembling a finger | Synonyms: digitate |
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| finical | (adjective) exacting especially about details | Synonyms: finicky, fussy, particular, picky |
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| finicky | (adjective) exacting especially about details | Synonyms: finical, fussy, particular, picky |
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| finished | (adjective) ended or brought to an end | - |
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| (adjective) (of materials or goods) brought to the desired final state | - |
| (adjective) brought to ruin | Synonyms: ruined |
| (adjective) having a surface coating or finish applied | - |
| (adjective) (of skills or the products of skills) brought to or having the greatest excellence; perfected | - |
| 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 | - |
| fired | (adjective) having lost your job | Synonyms: discharged, dismissed, laid-off, pink-slipped |
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| fireproof | (adjective) impervious to damage by fire | - |
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| firm | (adjective) unwavering in devotion to friend or vow or cause | Synonyms: fast, loyal, truehearted |
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| (adjective) securely fixed in place | Synonyms: fast, immobile |
| (adjective) strong and sure | Synonyms: strong |
| (adjective) not soft or yielding to pressure | Synonyms: solid |
| (adjective) possessing the tone and resiliency of healthy tissue | - |
| (adjective) marked by firm determination or resolution; not shakable | Synonyms: steadfast, steady, stiff, unbendable, unfaltering, unshakable, unwavering |
| (adjective) securely established | - |
| (adjective) not subject to revision or change | - |
| (adjective) (of especially a person's physical features) not shaking or trembling | - |
| (adjective) not liable to fluctuate or especially to fall | Synonyms: steady, unfluctuating |
| firmamental | (adjective) relating to the firmament or upper regions | - |
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| first | (adjective) preceding all others in time or space or degree | Synonyms: 1st |
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| (adjective) highest in pitch or chief among parts or voices or instruments or orchestra sections | - |
| (adjective) ranking above all others | Synonyms: foremost, world-class |
| (adjective) serving to begin | Synonyms: beginning |
| (adjective) serving to set in motion | Synonyms: inaugural, initiative, initiatory, maiden |
| firstborn | (adjective) first in order of birth | Synonyms: eldest |
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| firsthand | (adjective) received directly from a source | - |
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| fiscal | (adjective) involving financial matters | Synonyms: financial |
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| fisheye | (adjective) of or relating to a fisheye lens | Synonyms: wide-angle |
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| fishy | (adjective) of or relating to or resembling fish | - |
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| (adjective) not as expected | Synonyms: funny, shady, suspect, suspicious |
| 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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| fissiparous | (adjective) reproducing by fission | - |
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| (adjective) having separated or advocating separation from another entity or policy or attitude | Synonyms: breakaway, separatist |
| fistular | (adjective) hollow and tube-shaped like a reed | Synonyms: fistulate, fistulous |
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| fistulate | (adjective) hollow and tube-shaped like a reed | Synonyms: fistular, fistulous |
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| fistulous | (adjective) of or pertaining to or resembling a fistula | - |
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| (adjective) hollow and tube-shaped like a reed | Synonyms: fistular, fistulate |
| fit | (adjective) physically and mentally sound or healthy | - |
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| (adjective) meeting adequate standards for a purpose | - |
| (adjective) (usually followed by `to' or `for') on the point of or strongly disposed | Synonyms: primed, set |
| fitful | (adjective) intermittently stopping and starting | Synonyms: interrupted, off-and-on |
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| (adjective) occurring in spells and often abruptly | Synonyms: spasmodic |
| fitted | (adjective) being the right size and shape to fit as desired | - |
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| fitter | (adjective) improved in health or physical condition | Synonyms: healthier |
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| fitting | (adjective) being precisely fitting and right | Synonyms: meet |
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| (adjective) in harmony with the spirit of particular persons or occasion | Synonyms: decent |
| five | (adjective) being one more than four | Synonyms: 5, v |
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| fivefold | (adjective) having five units or components | Synonyms: five-fold, quintuple |
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| fixed | (adjective) securely placed or fastened or set | - |
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| (adjective) (of a number) having a fixed and unchanging value | - |
| (adjective) fixed and unmoving | Synonyms: rigid, set |
| (adjective) incapable of being changed or moved or undone; e.g. "frozen prices" | Synonyms: frozen |
| fizzing | (adjective) hissing and bubbling | Synonyms: fizzy |
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| fizzy | (adjective) hissing and bubbling | Synonyms: fizzing |
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