| unparliamentary | (adjective) so rude and abusive as to be unsuitable for parliament | - |
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| unsanitary | (adjective) not sanitary or healthful | Synonyms: insanitary, unhealthful |
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| unsectarian | (adjective) not restricted to one sect or school or party | Synonyms: nonsectarian |
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| unstarred | (adjective) not marked with an asterisk | Synonyms: unasterisked |
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| untarnished | (adjective) (of reputation) free from blemishes | Synonyms: stainless, unstained, unsullied, untainted |
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| unvoluntary | (adjective) not subject to the control of the will | Synonyms: involuntary, nonvoluntary |
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| upstart | (adjective) characteristic of someone who has risen economically or socially but lacks the social skills appropriate for this new position | Synonyms: nouveau-riche, parvenu, parvenue |
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| utilitarian | (adjective) having a useful function | Synonyms: useful |
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| (adjective) having utility often to the exclusion of values | - |
| voluntary | (adjective) of your own free will or design; done by choice; not forced or compelled | - |
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| (adjective) controlled by individual volition | - |