| unprecedented | (adjective) having no precedent; novel; never seen before | - |
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| unpredicted | (adjective) without warning or announcement | Synonyms: unannounced, unheralded |
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| unpremeditated | (adjective) not premeditated | - |
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| (adjective) not prepared or planned in advance | - |
| unprompted | (adjective) proceeding from natural feeling or impulse without external stimulus | Synonyms: impulsive |
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| unprotected | (adjective) lacking protection or defense | - |
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| unreciprocated | (adjective) not returned in kind | Synonyms: unanswered, unrequited |
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| unreconstructed | (adjective) adhering to an attitude or position widely held to be outmoded | - |
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| unreflected | (adjective) (especially of incident sound or light) not turned back by physical reflection | - |
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| unregenerated | (adjective) not reformed morally or spiritually | Synonyms: unregenerate |
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| unregulated | (adjective) not regulated; not subject to rule or discipline | - |
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| (adjective) without regulation or discipline | - |
| unrelated | (adjective) not connected by kinship | - |
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| (adjective) lacking a logical or causal relation | - |
| unreported | (adjective) not reported | - |
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| unrequested | (adjective) not requested | - |
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| unrequited | (adjective) not returned in kind | Synonyms: unanswered, unreciprocated |
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| unrested | (adjective) not rested or refreshed | Synonyms: unrefreshed |
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| unrestricted | (adjective) not subject to or subjected to restriction | - |
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| (adjective) free of restrictions on conduct | - |
| (adjective) not restricted or exclusive | Synonyms: unexclusive |
| (adjective) never having had security classification | Synonyms: nonsensitive |
| (adjective) not restricted or modified in meaning | - |
| unsalted | (adjective) without salt or seasoning | Synonyms: unseasoned |
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| unsated | (adjective) not having been satisfied | Synonyms: unsatiated, unsatisfied |
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| unsatiated | (adjective) not having been satisfied | Synonyms: unsated, unsatisfied |
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| unsaturated | (adjective) used of a compound (especially of carbon) containing atoms sharing more than one valence bond | - |
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| (adjective) not saturated; capable of dissolving more of a substance at a given temperature | - |
| (adjective) (of color) not chromatically pure; diluted | - |
| unscripted | (adjective) not furnished with or using a script | - |
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| unsegmented | (adjective) having a body that is not divided into segments | Synonyms: nonsegmental |
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| unsegregated | (adjective) rid of segregation; having had segregation ended | Synonyms: desegrated, nonsegregated |
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| unselected | (adjective) not selected | - |
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| unsighted | (adjective) unable to see | Synonyms: blind |
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| unsolicited | (adjective) not requested or sought | Synonyms: unasked-for |
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| unsophisticated | (adjective) not wise in the ways of the world | Synonyms: unworldly |
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| (adjective) awkwardly simple and provincial | Synonyms: bumpkinly, hick, rustic |
| (adjective) lacking complexity | Synonyms: uncomplicated |
| unsorted | (adjective) not categorized or sorted | Synonyms: uncategorised, uncategorized |
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| (adjective) not arranged according to size | - |
| unspotted | (adjective) without soil or spot or stain | Synonyms: unsoiled, unstained |
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| unstated | (adjective) not made explicit | Synonyms: unexpressed, unsaid, unspoken, unuttered, unverbalised, unverbalized, unvoiced |
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| unstilted | (adjective) flowing naturally and continuously | - |
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| unstinted | (adjective) very generous | Synonyms: lavish, munificent, overgenerous, too-generous, unsparing, unstinting |
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| unsubstantiated | (adjective) unsupported by other evidence | Synonyms: uncorroborated |
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| unsuited | (adjective) not easy to combine harmoniously | Synonyms: ill-sorted, incompatible, mismated |
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| unsupported | (adjective) not held up or borne | - |
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| (adjective) not sustained or maintained by nonmaterial aid | - |
| unsuspected | (adjective) not suspected or believed likely | - |
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| untainted | (adjective) (of reputation) free from blemishes | Synonyms: stainless, unstained, unsullied, untarnished |
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| untalented | (adjective) devoid of talent; not gifted | Synonyms: talentless |
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| untasted | (adjective) still full | Synonyms: untouched |
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| untenanted | (adjective) not leased to or occupied by a tenant | Synonyms: unoccupied |
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| untested | (adjective) not tried or tested by experience | Synonyms: unseasoned, untried, young |
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| (adjective) not yet proved or subjected to testing | Synonyms: untried |
| untoasted | (adjective) not having been browned by exposure to heat | - |
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| untreated | (adjective) not subjected to chemical or physical treatment | - |
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| (adjective) not given medical care or treatment | - |
| (adjective) (of a specimen for study under a microscope) not treated with a reagent or dye | - |
| untufted | (adjective) not adorned with tufts | - |
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| untwisted | (adjective) not twisted; formerly twisted but now straight | - |
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| unvaccinated | (adjective) not vaccinated | - |
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| unvented | (adjective) not provided with vents | - |
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| unventilated | (adjective) not ventilated | - |
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| unwanted | (adjective) not wanted; not needed | - |
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| (adjective) not wanted | Synonyms: undesirable |
| unwarranted | (adjective) incapable of being justified or explained | Synonyms: indefensible, insupportable, unjustifiable, unwarrantable |
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| (adjective) lacking justification or authorization | Synonyms: undue, unjustified |
| (adjective) without a basis in reason or fact | Synonyms: baseless, groundless, idle, unfounded, wild |
| unwonted | (adjective) unaccustomed or unusual | - |
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| uplifted | (adjective) exalted emotionally especially with pride | - |
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| vaccinated | (adjective) having been rendered unsusceptible to a disease | Synonyms: immunised, immunized |
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| vacuolated | (adjective) formed into or containing one or more vacuoles or small membrane-bound cavities within a cell | Synonyms: vacuolate |
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| validated | (adjective) declared or made legally valid | - |
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| variegated | (adjective) having a variety of colors | Synonyms: varicolored, varicoloured |
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| vaulted | (adjective) having a hemispherical vault or dome | Synonyms: domed |
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| vented | (adjective) supplied with a vent or vents for intake of air or discharge of gases | - |
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| ventilated | (adjective) exposed to air | - |
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| vermiculated | (adjective) decorated with wormlike tracery or markings | Synonyms: vermicular, vermiculate |
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| verticillated | (adjective) forming one or more whorls (especially a whorl of leaves around a stem) | Synonyms: verticillate, whorled |
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| vested | (adjective) fixed and absolute and without contingency | - |
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| vestmented | (adjective) dressed in ceremonial garments especially clerical vestment | - |
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| vindicated | (adjective) freed from any question of guilt | Synonyms: absolved, clear, cleared, exculpated, exonerated |
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| violated | (adjective) treated irreverently or sacrilegiously | Synonyms: profaned |
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| vitiated | (adjective) ruined in character or quality | Synonyms: corrupted, debased |
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| (adjective) impaired by diminution | Synonyms: diminished, lessened, weakened |
| voluted | (adjective) in the shape of a coil | Synonyms: coiling, helical, spiral, spiraling, spiralling, turbinate, volute, whorled |
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| wainscoted | (adjective) fitted or decorated with panels or wainscoting | Synonyms: paneled, panelled |
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| wanted | (adjective) desired or wished for or sought | - |
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| (adjective) characterized by feeling or showing fond affection for | Synonyms: cherished, precious, treasured |
| warmhearted | (adjective) marked by warmth of feeling like kindness and sympathy and generosity | - |
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| wasted | (adjective) (of an organ or body part) diminished in size or strength as a result of disease or injury or lack of use | Synonyms: atrophied, diminished |
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| (adjective) not used to good advantage | Synonyms: squandered |
| (adjective) very thin especially from disease or hunger or cold | Synonyms: cadaverous, emaciated, gaunt, haggard, pinched, skeletal |
| (adjective) serving no useful purpose; having no excuse for being | Synonyms: otiose, pointless, purposeless, senseless, superfluous |
| weighted | (adjective) adjusted to reflect value or proportion | - |
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| (adjective) made heavy or weighted down with weariness | Synonyms: leaden |
| wholehearted | (adjective) with unconditional and enthusiastic devotion | Synonyms: heart-whole, whole-souled |
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| wilted | (adjective) (of plants) limp due to heat, loss of water, or disease | - |
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| (adjective) without energy or will | Synonyms: limp |
| wonted | (adjective) commonly used or practiced; usual | Synonyms: accustomed, customary, habitual |
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| worsted | (noun) a woolen fabric with a hard textured surface and no nap; woven of worsted yarns "he wore a worsted suit" | - |
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| (noun) a tightly twisted woolen yarn spun from long-staple wool | Synonyms: worsted yarn |