| unfrightened | (adjective) not affected by fright | - |
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| unlighted | (adjective) not set afire or burning | Synonyms: unlit |
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| (adjective) without illumination | Synonyms: lightless, unilluminated, unlit |
| 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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| unsought | (adjective) not desired | Synonyms: undesired |
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| untaught | (adjective) lacking in schooling | Synonyms: unschooled, untutored |
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| unthought | (adjective) so unexpected as to have not been imagined | Synonyms: unhoped-for, unhoped, unthought-of |
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| unthoughtful | (adjective) not exhibiting or characterized by careful thought | Synonyms: unreflective, unthinking |
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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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| 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 |
| wrought | (adjective) shaped to fit by or as if by altering the contours of a pliable mass (as by work or effort) | Synonyms: molded, shaped |
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