| unashamed | (adjective) used of persons or their behavior; feeling no shame | - |
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| unashamedly | (adverb) without shame | Synonyms: barefacedly, shamelessly |
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| underframe | (noun) the internal supporting structure that gives an artifact its shape | Synonyms: frame, skeletal frame, skeleton |
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| undreamed | (adjective) not imagined even in a dream | Synonyms: undreamed of, undreamt, undreamt of, unimagined |
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| unframed | (adjective) not provided with a frame | - |
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| unicameral | (adjective) composed of one legislative body | - |
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| unlamented | (adjective) not grieved for; causing no mourning | Synonyms: unmourned |
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| unnameable | (adjective) too sacred to be uttered | Synonyms: ineffable, unspeakable, unutterable |
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| unnamed | (adjective) being or having an unknown or unnamed source | Synonyms: nameless, unidentified, unknown |
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| unornamented | (adjective) lacking embellishment or ornamentation | Synonyms: bare, plain, spare, unembellished |
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| unparliamentary | (adjective) so rude and abusive as to be unsuitable for parliament | - |
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| unseamed | (adjective) having no seams | - |
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| (adjective) smooth, especially of skin | Synonyms: seamless, unlined |
| untamed | (adjective) in a natural state; not tamed or domesticated or cultivated | Synonyms: wild |
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