| extracurricular | (adjective) characterized by adultery | Synonyms: adulterous, extramarital |
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| (adjective) outside the regular duties of your job or profession | - |
| (adjective) outside the regular academic curriculum | - |
| extragalactic | (adjective) outside or beyond a galaxy | - |
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| faced | (adjective) having a face or facing especially of a specified kind or number; often used in combination | - |
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| faceless | (adjective) without a face or identity | - |
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| faceted | (adjective) having facets | - |
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| facetious | (adjective) cleverly amusing in tone | Synonyms: bantering, tongue-in-cheek |
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| facial | (adjective) of or concerning the face | - |
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| (adjective) of or pertaining to the outside surface of an object | - |
| facile | (adjective) expressing yourself readily, clearly, effectively | Synonyms: eloquent, fluent, silver-tongued, silver, smooth-spoken |
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| (adjective) performing adroitly and without effort | - |
| (adjective) superficially impressive, but lacking depth and attention to the true complexities of a subject | Synonyms: neat, slick |
| facilitative | (adjective) freeing from difficulty or impediment | - |
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| facilitatory | (adjective) inducing or aiding in facilitating neural activity | - |
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| factious | (adjective) dissenting (especially dissenting with the majority opinion) | Synonyms: dissentious, divisive |
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| factitious | (adjective) not produced by natural forces | - |
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| factorial | (adjective) of or relating to factorials | - |
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| factual | (adjective) of or relating to or characterized by facts | - |
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| (adjective) existing in act or fact | Synonyms: actual |
| 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 |
| fallacious | (adjective) involving deception | Synonyms: deceitful, fraudulent |
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| (adjective) based on an incorrect or misleading notion or information | - |
| (adjective) containing or based on a fallacy | Synonyms: unsound |
| farinaceous | (adjective) composed of or covered with particles resembling meal in texture or consistency | Synonyms: coarse-grained, grainy, granular, granulose, gritty, mealy |
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| (adjective) resembling starch | Synonyms: amylaceous, amyloid, amyloidal, starchlike |
| flaccid | (adjective) drooping without elasticity; wanting in stiffness | - |
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| (adjective) out of condition; not strong or robust; incapable of exertion or endurance | Synonyms: flabby, soft |
| foliaceous | (adjective) of or pertaining to or resembling the leaf of a plant | - |
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| (adjective) bearing numerous leaves | Synonyms: foliaged, foliose |
| (adjective) (especially of metamorphic rock) having thin leaflike layers or strata | Synonyms: foliate, foliated |
| fractional | (adjective) constituting or comprising a part or fraction of a possible whole or entirety | Synonyms: partial |
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| (adjective) constituting a division or an aliquot part of the basic monetary unit | Synonyms: divisional |
| fractious | (adjective) unpredictably difficult in operation; likely to be troublesome | - |
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| (adjective) stubbornly resistant to authority or control | Synonyms: recalcitrant, refractory |
| (adjective) easily irritated or annoyed | Synonyms: cranky, irritable, nettlesome, peckish, peevish, pettish, petulant, scratchy, techy, testy, tetchy |
| fugacious | (adjective) lasting a very short time | Synonyms: ephemeral, passing, short-lived, transient, transitory |
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| galactic | (adjective) of or relating to a galaxy (especially our galaxy the Milky Way) | - |
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| (adjective) inconceivably large | Synonyms: astronomic, astronomical |
| gallinaceous | (adjective) of or relating to or resembling a gallinacean | - |
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| gimcrack | (adjective) tastelessly showy | Synonyms: brassy, cheap, flash, flashy, garish, gaudy, loud, meretricious, tacky, tatty, tawdry, trashy |
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| glace | (adjective) (used especially of fruits) preserved by coating with or allowing to absorb sugar | Synonyms: candied, crystalised, crystalized |
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| glacial | (adjective) relating to or derived from a glacier | - |
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| (adjective) extremely cold | Synonyms: arctic, frigid, gelid, icy, polar |
| (adjective) devoid of warmth and cordiality; expressive of unfriendliness or disdain | Synonyms: frigid, frosty, frozen, icy, wintry |
| glaciated | (adjective) covered with ice (as by a glacier) or affected by glacial action | - |
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| gobsmacked | (adjective) utterly astounded | - |
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| graceful | (adjective) characterized by beauty of movement, style, form, or execution | - |
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| (adjective) suggesting taste, ease, and wealth | Synonyms: elegant, refined |
| graceless | (adjective) lacking grace; clumsy | Synonyms: ungraceful |
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| (adjective) lacking social polish | Synonyms: gauche, unpolished |
| (adjective) lacking graciousness | - |
| gracile | (adjective) slender and graceful | Synonyms: willowy |
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| gracious | (adjective) characterized by charm, good taste, and generosity of spirit | - |
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| (adjective) characterized by kindness and warm courtesy especially of a king to his subjects | Synonyms: benignant |
| (adjective) exhibiting courtesy and politeness | Synonyms: courteous, nice |
| (adjective) disposed to bestow favors | - |
| hackneyed | (adjective) repeated too often; overfamiliar through overuse | Synonyms: banal, commonplace, old-hat, shopworn, stock, threadbare, timeworn, tired, trite, well-worn |
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| hardback | (adjective) having a hard back or cover | Synonyms: hardbacked, hardbound, hardcover |
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| hardbacked | (adjective) having a hard back or cover | Synonyms: hardback, hardbound, hardcover |
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| heliac | (adjective) pertaining to or near the sun; especially the first rising of a star after and last setting before its invisibility owing to its conjunction with the sun | Synonyms: heliacal |
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| heliacal | (adjective) pertaining to or near the sun; especially the first rising of a star after and last setting before its invisibility owing to its conjunction with the sun | Synonyms: heliac |
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| herbaceous | (adjective) characteristic of a nonwoody herb or plant part | - |
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| heterodactyl | (adjective) (of bird feet) having the first and second toes directed backward the third and fourth forward | - |
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| humpbacked | (adjective) characteristic of or suffering from kyphosis, an abnormality of the vertebral column | Synonyms: crookback, crookbacked, gibbous, humped, hunchbacked, kyphotic |
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| hunchbacked | (adjective) characteristic of or suffering from kyphosis, an abnormality of the vertebral column | Synonyms: crookback, crookbacked, gibbous, humpbacked, humped, kyphotic |
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| hyperactive | (adjective) more active than normal | Synonyms: overactive |
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| hypoactive | (adjective) abnormally inactive | Synonyms: underactive |
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| hypochondriac | (adjective) suffering from hypochondria | Synonyms: hypochondriacal |
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| hypochondriacal | (adjective) suffering from hypochondria | Synonyms: hypochondriac |
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| iliac | (adjective) of or relating to the ilium | - |
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| immaculate | (adjective) completely neat and clean | Synonyms: speckless, spic-and-span, spic, spick-and-span, spick, spotless |
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| (adjective) without fault or error | Synonyms: faultless, impeccable, incorrupted |
| (adjective) free from stain or blemish | Synonyms: undefiled |
| impacted | (adjective) wedged or packed in together | Synonyms: wedged |
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| implacable | (adjective) incapable of being placated | - |
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| impracticable | (adjective) not capable of being carried out or put into practice | Synonyms: infeasible, unfeasible, unworkable |
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| impractical | (adjective) not practical; not workable or not given to practical matters | - |
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| (adjective) not practical or realizable; speculative | Synonyms: airy, Laputan, visionary, windy |
| inaccessible | (adjective) capable of being reached only with great difficulty or not at all | Synonyms: unaccessible |
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| (adjective) not capable of being obtained | Synonyms: unobtainable, unprocurable, untouchable |
| inaccurate | (adjective) erroneous | - |
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| inactive | (adjective) (military) not involved in military operations | Synonyms: nonoperational |
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| (adjective) not active physically or mentally | - |
| (adjective) (pathology) not progressing or increasing; or progressing slowly | - |
| (adjective) lacking activity; lying idle or unused | - |
| (adjective) lacking in energy or will | Synonyms: passive |
| (adjective) (of e.g. volcanoes) not erupting and not extinct | Synonyms: dormant |
| (adjective) not exerting influence or change | - |
| (adjective) not engaged in full-time work | - |
| (adjective) not in physical motion | Synonyms: motionless, static, still |
| (adjective) (chemistry) not participating in a chemical reaction; chemically inert | - |
| incapacitated | (adjective) lacking in or deprived of strength or power | Synonyms: helpless |
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| incapacitating | (adjective) that cripples or disables or incapacitates | Synonyms: crippling, disabling |
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| inefficacious | (adjective) lacking the power to produce a desired effect | - |
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| inexact | (adjective) not exact | - |
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| insomniac | (adjective) experiencing or accompanied by sleeplessness | Synonyms: sleepless, watchful |
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| intact | (adjective) (used of domestic animals) sexually competent | Synonyms: entire |
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| (adjective) undamaged in any way | - |
| (adjective) (of a woman) having the hymen unbroken | Synonyms: inviolate |
| (adjective) constituting the undiminished entirety; lacking nothing essential especially not damaged | Synonyms: entire, integral |
| interactional | (adjective) capable of acting on or influencing each other | Synonyms: interactive |
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| interactive | (adjective) used especially of drugs or muscles that work together so the total effect is greater than the sum of the two (or more) | Synonyms: synergistic |
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| (adjective) capable of acting on or influencing each other | Synonyms: interactional |
| interfacial | (adjective) relating to or situated at an interface | - |
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| intergalactic | (adjective) between or among galaxies | - |
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| interlaced | (adjective) having a pattern of fretwork or latticework | Synonyms: fretted, latticed, latticelike |
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| interlacing | (adjective) linked or locked closely together as by dovetailing | Synonyms: interlinking, interlocking, interwoven |
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| interracial | (adjective) involving or composed of different races | Synonyms: mixed |
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| (adjective) between races | - |
| intracellular | (adjective) located or occurring within a cell or cells | - |
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| intracerebral | (adjective) within the brain | - |
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| intracranial | (adjective) within the skull | - |
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| intractable | (adjective) not tractable; difficult to manage or mold | - |
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| intracutaneous | (adjective) relating to areas between the layers of the skin | Synonyms: intradermal, intradermic |
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| iridaceous | (adjective) of or pertaining to or characteristic of plants of the family Iridaceae | - |
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| irreplaceable | (adjective) impossible to replace | Synonyms: unreplaceable |
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| irreproachable | (adjective) free of guilt; not subject to blame | Synonyms: blameless, inculpable, unimpeachable |
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| knackered | (adjective) extremely exhausted | Synonyms: drained |
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| laced | (adjective) closed with a lace | Synonyms: tied |
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| (adjective) edged or streaked with color | - |
| lacelike | (adjective) made of or resembling lace | Synonyms: lacy |
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| lacerate | (adjective) having edges that are jagged from injury | Synonyms: lacerated, mangled, torn |
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| (adjective) irregularly slashed and jagged as if torn | Synonyms: lacerated |
| lacerated | (adjective) having edges that are jagged from injury | Synonyms: lacerate, mangled, torn |
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| (adjective) irregularly slashed and jagged as if torn | Synonyms: lacerate |
| lacertilian | (adjective) of or relating to lizards | Synonyms: saurian |
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| lachrymal | (adjective) of or relating to tears | Synonyms: lacrimal |
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| (adjective) relating to or located near the organ that produces tears | Synonyms: lacrimal |
| lachrymatory | (adjective) relating to or prompting tears | Synonyms: lacrimatory |
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| lachrymose | (adjective) showing sorrow | Synonyms: dolorous, dolourous, tearful, weeping |
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| laciniate | (adjective) having edges irregularly and finely slashed | Synonyms: fringed |
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| lackadaisical | (adjective) idle or indolent especially in a dreamy way | - |
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| (adjective) lacking spirit or liveliness | Synonyms: dreamy, languid, languorous |
| lacking | (adjective) inadequate in amount or degree | Synonyms: deficient, wanting |
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| (adjective) nonexistent | Synonyms: absent, missing, wanting |
| lackluster | (adjective) lacking luster or shine | Synonyms: lacklustre, lusterless, lustreless |
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| (adjective) lacking brilliance or vitality | Synonyms: lacklustre, lusterless, lustreless |
| lacklustre | (adjective) lacking luster or shine | Synonyms: lackluster, lusterless, lustreless |
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| (adjective) lacking brilliance or vitality | Synonyms: lackluster, lusterless, lustreless |
| laconic | (adjective) brief and to the point; effectively cut short | Synonyms: crisp, curt, terse |
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| lacrimal | (adjective) of or relating to tears | Synonyms: lachrymal |
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| (adjective) relating to or located near the organ that produces tears | Synonyms: lachrymal |
| lacrimatory | (adjective) relating to or prompting tears | Synonyms: lachrymatory |
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| lactating | (adjective) producing or secreting milk | Synonyms: wet |
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| lacteal | (adjective) relating to or consisting of or producing or resembling milk | - |
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| lactic | (adjective) of or relating to or obtained from milk (especially sour milk or whey) | - |
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| lactogenic | (adjective) inducing lactation | - |
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| lacustrine | (adjective) of or relating to or living near lakes | - |
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| lacy | (adjective) made of or resembling lace | Synonyms: lacelike |
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| (adjective) having open interstices or resembling a web | Synonyms: netlike, netted, webbed, webby, weblike |
| lilac | (adjective) of a pale purple color | Synonyms: lavender, lilac-colored |
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