| unpurified | (adjective) not made pure | - |
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| unreassuring | (adjective) not reassuring; tending to cause anxiety | Synonyms: worrisome |
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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 | - |
| unsavoury | (adjective) morally offensive | Synonyms: offensive, unsavory |
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| (adjective) not pleasing in odor or taste | Synonyms: distasteful, unsavory |
| unsecured | (adjective) without financial security | Synonyms: unguaranteed |
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| (adjective) not firmly fastened or secured | Synonyms: unbarred, unbolted, unlatched, unlocked |
| unsoured | (adjective) not having turned bad | - |
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| unstructured | (adjective) lacking definite structure or organization | - |
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| (adjective) lacking the system or structure characteristic of living bodies | Synonyms: amorphous |
| unsure | (adjective) lacking or indicating lack of confidence or assurance | Synonyms: incertain, uncertain |
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| (adjective) lacking self-confidence | Synonyms: diffident, shy, timid |
| unsurmountable | (adjective) not capable of being surmounted or overcome | Synonyms: insurmountable |
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| (adjective) incapable of being surmounted or climbed | Synonyms: unclimbable |
| unsurpassable | (adjective) not to be exceeded | - |
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| unsurpassed | (adjective) not capable of being improved on | Synonyms: unexceeded, unexcelled |
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| unsurprised | (adjective) not surprised or expressing surprise | Synonyms: not surprised |
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| unsurprising | (adjective) not causing surprise | - |
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| unturned | (adjective) not turned | - |
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| upcurved | (adjective) curving upward | - |
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| upturned | (adjective) (used of noses) turned up at the end | Synonyms: retrousse, tip-tilted |
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| (adjective) having been turned so that the bottom is no longer the bottom | Synonyms: overturned, upset |
| uraemic | (adjective) of or involving excess nitrogenous waste products in the urine (usually due to kidney insufficiency) | Synonyms: azotemic, uremic |
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| urban | (adjective) located in or characteristic of a city or city life | - |
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| (adjective) relating to or concerned with a city or densely populated area | - |
| urbane | (adjective) showing a high degree of refinement and the assurance that comes from wide social experience | Synonyms: polished, refined |
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| urbanised | (adjective) made urban in nature; taking on urban characteristics | Synonyms: urbanized |
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| urbanized | (adjective) made urban in nature; taking on urban characteristics | Synonyms: urbanised |
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| urceolate | (adjective) urn-shaped; large below and contracted toward the mouth | - |
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| uremic | (adjective) of or involving excess nitrogenous waste products in the urine (usually due to kidney insufficiency) | Synonyms: azotemic, uraemic |
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| urethral | (adjective) of or relating to the urethra | - |
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| urgent | (adjective) compelling immediate action | Synonyms: pressing |
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| uric | (adjective) in or relating to or obtained from urine | - |
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| uricosuric | (adjective) acting to increase the excretion of uric acid in the urine | - |
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| urinary | (adjective) of or relating to the function or production or secretion of urine | - |
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| (adjective) of or relating to the urinary system of the body | - |
| urogenital | (adjective) of or relating to the urinary and reproductive systems | - |
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| ursine | (adjective) of or relating to or similar to bears | - |
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| usurious | (adjective) greatly exceeding bounds of reason or moderation | Synonyms: exorbitant, extortionate, outrageous, steep, unconscionable |
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| vapourific | (adjective) resembling or characteristic of vapor | Synonyms: vaporific, vaporish, vaporous, vapourish, vapourous |
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| (adjective) (used of substances) capable of being volatilized | Synonyms: evaporable, vaporific, vaporizable, vapourisable, volatilisable, volatilizable |
| vapourisable | (adjective) (used of substances) capable of being volatilized | Synonyms: evaporable, vaporific, vaporizable, vapourific, volatilisable, volatilizable |
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| vapourised | (adjective) converted into a gas or vapor | Synonyms: gasified, vaporized, volatilised, volatilized |
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| vapourish | (adjective) resembling or characteristic of vapor | Synonyms: vaporific, vaporish, vaporous, vapourific, vapourous |
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| vapourous | (adjective) filled with vapor | Synonyms: miasmal, miasmic, vaporous |
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| (adjective) resembling or characteristic of vapor | Synonyms: vaporific, vaporish, vaporous, vapourific, vapourish |
| (adjective) so thin as to transmit light | Synonyms: cobwebby, diaphanous, filmy, gauze-like, gauzy, gossamer, see-through, sheer, transparent, vaporous |
| varicoloured | (adjective) having sections or patches colored differently and usually brightly | Synonyms: calico, motley, multi-color, multi-colored, multi-colour, multi-coloured, multicolor, multicolored, multicolour, multicoloured, painted, particolored, particoloured, piebald, pied, varicolored |
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| (adjective) having a variety of colors | Synonyms: varicolored, variegated |
| venturesome | (adjective) disposed to venture or take risks | Synonyms: audacious, daring, venturous |
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| venturous | (adjective) disposed to venture or take risks | Synonyms: audacious, daring, venturesome |
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| voyeuristic | (adjective) of or relating to voyeurs or voyeurism | Synonyms: voyeuristical |
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| voyeuristical | (adjective) of or relating to voyeurs or voyeurism | Synonyms: voyeuristic |
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| vulturine | (adjective) living by preying on other animals especially by catching living prey | Synonyms: predatory, rapacious, raptorial, ravening, vulturous |
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| vulturous | (adjective) living by preying on other animals especially by catching living prey | Synonyms: predatory, rapacious, raptorial, ravening, vulturine |
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| windburned | (adjective) suffering from windburn | Synonyms: windburnt |
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| windburnt | (adjective) suffering from windburn | Synonyms: windburned |
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