| unfrightened | (adjective) not affected by fright | - |
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| unintelligent | (adjective) lacking intelligence | Synonyms: stupid |
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| unintelligible | (adjective) poorly articulated or enunciated, or drowned by noise | - |
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| (adjective) hard or impossible to understand | Synonyms: opaque |
| unlighted | (adjective) not set afire or burning | Synonyms: unlit |
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| (adjective) without illumination | Synonyms: lightless, unilluminated, unlit |
| unmitigable | (adjective) incapable of being mitigated | - |
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| unmitigated | (adjective) not diminished or moderated in intensity or severity; sometimes used as an intensifier | - |
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| unnavigable | (adjective) incapable of being navigated | - |
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| unneighborly | (adjective) not exhibiting the qualities expected in a friendly neighbor | Synonyms: unneighbourly |
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| unneighbourly | (adjective) not exhibiting the qualities expected in a friendly neighbor | Synonyms: unneighborly |
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| unobligated | (adjective) not obligated | - |
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| unobliging | (adjective) not accommodating | Synonyms: unaccommodating |
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| unoriginal | (adjective) not original; not being or productive of something fresh and unusual | - |
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| unpigmented | (adjective) having no pigmentation | - |
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| unrigged | (adjective) stripped of rigging | - |
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| unrighteous | (adjective) not righteous | - |
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| unsighted | (adjective) unable to see | Synonyms: blind |
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| unsightly | (adjective) unpleasant to look at | - |
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| unsigned | (adjective) lacking a signature | - |
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| unvigilant | (adjective) not alert to what is potentially dangerous | Synonyms: unalert, unwatchful |
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| upright | (adjective) upright in position or posture | Synonyms: erect, vertical |
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| (adjective) of moral excellence | Synonyms: good, just |
| (adjective) in a vertical position; not sloping | Synonyms: unsloped |
| uptight | (adjective) being in a tense state | Synonyms: edgy, high-strung, highly strung, jittery, jumpy, nervy, overstrung, restive |
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| vertiginous | (adjective) having or causing a whirling sensation; liable to falling | Synonyms: dizzy, giddy, woozy |
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| vestigial | (adjective) not fully developed in mature animals | Synonyms: rudimentary |
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| vigesimal | (adjective) relating to or based on the number twenty | - |
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| vigilant | (adjective) carefully observant or attentive; on the lookout for possible danger | Synonyms: argus-eyed, open-eyed, wakeful, watchful |
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| vigorous | (adjective) characterized by forceful and energetic action or activity | - |
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| (adjective) strong and active physically or mentally | - |
| vitiliginous | (adjective) of or relating to or having vitiligo | - |
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| watertight | (adjective) without flaws or loopholes | Synonyms: bulletproof, ironclad, unassailable, unshakable |
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| (adjective) not allowing water to pass in or out | - |
| weighted | (adjective) adjusted to reflect value or proportion | - |
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| (adjective) made heavy or weighted down with weariness | Synonyms: leaden |
| weightless | (adjective) having little or no weight or apparent gravitational pull; light | - |
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| weighty | (adjective) having relatively great weight; heavy | - |
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| (adjective) excessively fat | Synonyms: corpulent, obese, rotund |
| (adjective) weighing heavily on the spirit; causing anxiety or worry | - |
| (adjective) of great gravity or crucial import; requiring serious thought | Synonyms: grave, grievous, heavy |
| (adjective) powerfully persuasive | Synonyms: cogent, telling |
| wigged | (adjective) wearing a wig | - |
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| wiggly | (adjective) curved or curving in and out | Synonyms: sinuate, sinuous |
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| (adjective) moving in a twisting or snake-like or wormlike fashion | Synonyms: wriggling, wriggly, writhing |
| wigless | (adjective) not wearing a wig | - |
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| wriggling | (adjective) moving in a twisting or snake-like or wormlike fashion | Synonyms: wiggly, wriggly, writhing |
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| wriggly | (adjective) moving in a twisting or snake-like or wormlike fashion | Synonyms: wiggly, wriggling, writhing |
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| zaftig | (adjective) (of a female body) healthily plump and vigorous | Synonyms: buxom, zoftig |
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| zigzag | (adjective) having short sharp turns or angles | Synonyms: zig-zag |
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| zoftig | (adjective) (of a female body) healthily plump and vigorous | Synonyms: buxom, zaftig |
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