| uninterrupted | (adjective) continuing in time or space without interruption | Synonyms: continuous |
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| (adjective) having undisturbed continuity | - |
| unintimidated | (adjective) not shrinking from danger | Synonyms: unblinking, unflinching, unshrinking |
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| unintoxicated | (adjective) not inebriated | Synonyms: uninebriated |
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| unintrusive | (adjective) not interfering or meddling | Synonyms: not intrusive |
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| uninucleate | (adjective) having one nucleus | - |
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| uninventive | (adjective) deficient in originality or creativity; lacking powers of invention | Synonyms: sterile, unimaginative, uninspired |
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| uninvited | (adjective) (of a person) not having been invited | - |
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| (adjective) (of a thought or act) unwelcome or involuntary | - |
| uninviting | (adjective) neither attractive nor tempting | - |
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| (adjective) not tempting | Synonyms: untempting |
| uninvolved | (adjective) not involved | - |
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| (adjective) showing lack of emotional involvement | Synonyms: degage, detached |
| union | (adjective) of trade unions | - |
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| unionised | (adjective) not converted into ions | Synonyms: nonionic, nonionised, nonionized, unionized |
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| (adjective) being a member of or formed into a labor union | Synonyms: organised, organized, unionized |
| unionized | (adjective) not converted into ions | Synonyms: nonionic, nonionised, nonionized, unionised |
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| (adjective) being a member of or formed into a labor union | Synonyms: organised, organized, unionised |
| uniovular | (adjective) having a single ovule | Synonyms: uniovulate |
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| uniovulate | (adjective) having a single ovule | Synonyms: uniovular |
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| uniparous | (adjective) producing only one offspring at a time | - |
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| unipolar | (adjective) having a single pole | - |
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| unique | (adjective) radically distinctive and without equal | Synonyms: alone, unequaled, unequalled, unparalleled |
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| (adjective) the single one of its kind | Synonyms: singular |
| (adjective) (followed by `to') applying exclusively to a given category or condition or locality | - |
| (adjective) highly unusual or rare but not the single instance | - |
| unironed | (adjective) (of linens or clothes) not ironed | Synonyms: wrinkled |
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| unisex | (adjective) not distinguished on the basis of sex | - |
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| unisexual | (adjective) relating to only one sex or having only one type of sexual organ; not hermaphroditic | - |
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| unitary | (adjective) characterized by or constituting a form of government in which power is held by one central authority | - |
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| (adjective) of or pertaining to or involving the use of units | - |
| (adjective) relating to or characterized by or aiming toward unity | - |
| (adjective) having the indivisible character of a unit | Synonyms: one |
| united | (adjective) characterized by unity; being or joined into a single entity | - |
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| (adjective) of or relating to two people who are married to each other | Synonyms: joined |
| (adjective) involving the joint activity of two or more | Synonyms: concerted, conjunct, conjunctive, cooperative |
| univalent | (adjective) used of a chromosome that is not paired or united with its homologous chromosome during synapsis | - |
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| (adjective) having a valence of 1 | Synonyms: monovalent |
| univalve | (adjective) used of mollusks, especially gastropods, as snails etc. | - |
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| universal | (adjective) adapted to various purposes, sizes, forms, operations | - |
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| (adjective) of worldwide scope or applicability | Synonyms: cosmopolitan, ecumenical, general, oecumenical, world-wide, worldwide |
| (adjective) applicable to or common to all members of a group or set | - |
| universalist | (adjective) of or relating to or tending toward universalism | Synonyms: universalistic |
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| universalistic | (adjective) of or relating to or tending toward universalism | Synonyms: universalist |
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| (adjective) of or relating to the whole | - |
| univocal | (adjective) admitting of no doubt or misunderstanding; having only one meaning or interpretation and leading to only one conclusion | Synonyms: unambiguous, unequivocal |
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| unpunished | (adjective) not punished | - |
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