| unchristian | (adjective) not of a Christian faith | - |
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| unchristianly | (adjective) not becoming to or like a Christian | Synonyms: unchristlike |
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| unconstipated | (adjective) not constipated | Synonyms: regular |
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| unconstitutional | (adjective) not consistent with or according to a constitution; contrary to the U.S. Constitution | - |
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| undistinguishable | (adjective) not capable of being distinguished or differentiated | Synonyms: indistinguishable |
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| undistinguished | (adjective) not special in any way; lacking distinction | Synonyms: mine run, run-of-the-mill, run-of-the-mine, unexceptional |
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| undomestic | (adjective) not domestic or related to home | - |
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| undomesticated | (adjective) unaccustomed to home life | - |
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| (adjective) not domesticated | - |
| unenthusiastic | (adjective) not enthusiastic; lacking excitement or ardor | - |
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| unfastidious | (adjective) marked by an absence of due or proper care or attention to detail; not concerned with cleanliness | - |
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| (adjective) not exacting in nutritional requirements | - |
| uninteresting | (adjective) arousing no interest or attention or curiosity or excitement | - |
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| (adjective) characteristic or suggestive of an institution especially in being uniform or dull or unimaginative | Synonyms: institutional |
| universalistic | (adjective) of or relating to or tending toward universalism | Synonyms: universalist |
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| (adjective) of or relating to the whole | - |
| unjustifiable | (adjective) incapable of being justified or explained | Synonyms: indefensible, insupportable, unwarrantable, unwarranted |
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| unjustified | (adjective) lacking justification or authorization | Synonyms: undue, unwarranted |
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| unquestionable | (adjective) incapable of being questioned | - |
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| (adjective) not counterfeit or copied | Synonyms: authentic, bona fide, veritable |
| (adjective) not open to question | - |
| unquestioned | (adjective) generally agreed upon; not subject to dispute | Synonyms: unchallenged, undisputed |
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| unquestioning | (adjective) being without doubt or reserve | Synonyms: implicit |
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| (adjective) not inclined to ask questions | - |
| unrealistic | (adjective) not realistic | - |
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| unresisting | (adjective) offering no resistance, passively accepting of a situation | Synonyms: resistless |
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| unsarcastic | (adjective) not sarcastic | - |
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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 |
| unstilted | (adjective) flowing naturally and continuously | - |
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| unstimulating | (adjective) not stimulating | Synonyms: unexciting |
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| unstinted | (adjective) very generous | Synonyms: lavish, munificent, overgenerous, too-generous, unsparing, unstinting |
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| unstinting | (adjective) very generous | Synonyms: lavish, munificent, overgenerous, too-generous, unsparing, unstinted |
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| unstirred | (adjective) not agitated by stirring | - |
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| untrusting | (adjective) openly distrustful and unwilling to confide | Synonyms: leery, mistrustful, suspicious, wary |
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| vestiary | (adjective) relating to clothing (especially vestments) | - |
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| vestibular | (adjective) relating to the sense of equilibrium | - |
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| vestigial | (adjective) not fully developed in mature animals | Synonyms: rudimentary |
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| viscoelastic | (adjective) having viscous as well as elastic properties | - |
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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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| yogistic | (adjective) of or relating to yoga | Synonyms: yogic |
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