| 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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| unjointed | (adjective) without joints or jointed segments | - |
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| unjust | (adjective) violating principles of justice | - |
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| (adjective) not equitable or fair | Synonyms: inequitable |
| (adjective) not fair; marked by injustice or partiality or deception | Synonyms: unfair |
| 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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| unkempt | (adjective) not neatly combed | - |
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| (adjective) not properly maintained or cared for | - |
| unkept | (adjective) (especially of promises or contracts) having been violated or disregarded | Synonyms: broken |
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| unkeyed | (adjective) characterized by avoidance of traditional western tonality | Synonyms: atonal |
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| unkind | (adjective) lacking kindness | - |
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| (adjective) deficient in humane and kindly feelings | Synonyms: pitiless |
| unkindled | (adjective) not set afire | - |
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| unkindly | (adjective) lacking in sympathy and kindness | Synonyms: unsympathetic |
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| unknowable | (adjective) not knowable | - |
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| unknowing | (adjective) unaware because of a lack of relevant information or knowledge | Synonyms: ignorant, unknowledgeable, unwitting |
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| unknowledgeable | (adjective) unaware because of a lack of relevant information or knowledge | Synonyms: ignorant, unknowing, unwitting |
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| unknown | (adjective) not known | - |
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| (adjective) being or having an unknown or unnamed source | Synonyms: nameless, unidentified, unnamed |
| (adjective) not famous or acclaimed | Synonyms: obscure, unsung |
| (adjective) not known before | Synonyms: strange |
| (adjective) not known to exist | - |
| unlabeled | (adjective) lacking a label or tag | Synonyms: unlabelled, untagged |
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| unlabelled | (adjective) lacking a label or tag | Synonyms: unlabeled, untagged |
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| unlaced | (adjective) with laces not tied | Synonyms: untied |
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| (adjective) not under constraint in action or expression | Synonyms: unbuttoned |
| unladylike | (adjective) lacking the behavior or manner or style considered proper for a lady | - |
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| unlamented | (adjective) not grieved for; causing no mourning | Synonyms: unmourned |
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| unlatched | (adjective) not firmly fastened or secured | Synonyms: unbarred, unbolted, unlocked, unsecured |
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| unlaureled | (adjective) not crowned with laurel; having no acclaim or reward | Synonyms: unlaurelled |
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| unlaurelled | (adjective) not crowned with laurel; having no acclaim or reward | Synonyms: unlaureled |
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| unlawful | (adjective) contrary to or prohibited by or defiant of law | - |
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| (adjective) contrary to or forbidden by law | Synonyms: illegitimate, illicit, outlaw, outlawed |
| (adjective) having no legally established claim | Synonyms: wrongful |
| (adjective) not morally right or permissible | - |
| (adjective) not conforming to legality, moral law, or social convention | Synonyms: improper, unconventional |
| unleaded | (adjective) not treated with lead | Synonyms: leadless |
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| (adjective) not having leads between the lines | - |
| unlearned | (adjective) not established by conditioning or learning | Synonyms: innate, unconditioned |
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| (adjective) uneducated in general; lacking knowledge or sophistication | Synonyms: ignorant, nescient, unlettered |
| (adjective) not well learned | - |
| unleavened | (adjective) made without leavening | Synonyms: unraised |
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| unlettered | (adjective) having little acquaintance with writing | Synonyms: analphabetic |
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| (adjective) uneducated in general; lacking knowledge or sophistication | Synonyms: ignorant, nescient, unlearned |
| unlicenced | (adjective) lacking official approval | Synonyms: unaccredited, unlicensed |
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| unlicensed | (adjective) lacking official approval | Synonyms: unaccredited, unlicenced |
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| unlifelike | (adjective) without substance | Synonyms: cardboard |
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| unlighted | (adjective) not set afire or burning | Synonyms: unlit |
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| (adjective) without illumination | Synonyms: lightless, unilluminated, unlit |
| unlikable | (adjective) (of characters in literature or drama) tending to evoke antipathetic feelings | Synonyms: unappealing, unlikeable, unsympathetic |
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| (adjective) difficult or impossible to like | Synonyms: unlikeable |
| unlike | (adjective) marked by dissimilarity | - |
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| (adjective) not equal in amount | - |
| unlikeable | (adjective) (of characters in literature or drama) tending to evoke antipathetic feelings | Synonyms: unappealing, unlikable, unsympathetic |
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| (adjective) difficult or impossible to like | Synonyms: unlikable |
| unlikely | (adjective) has little chance of being the case or coming about | - |
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| (adjective) not likely to be true or to occur or to have occurred | Synonyms: improbable |
| (adjective) having a probability too low to inspire belief | Synonyms: improbable, unbelievable, unconvincing |
| unlimited | (adjective) having no limits in range or scope | Synonyms: limitless |
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| (adjective) that cannot be entirely consumed or used up | Synonyms: inexhaustible |
| (adjective) without reservation or exception | Synonyms: outright, straight-out |
| unlined | (adjective) not having a lining or liner | - |
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| (adjective) smooth, especially of skin | Synonyms: seamless, unseamed |
| unlipped | (adjective) without a lip or lips | Synonyms: lipless |
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| unlisted | (adjective) not on a list | - |
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| (adjective) not having your name entered on a voting list | - |
| unlit | (adjective) not set afire or burning | Synonyms: unlighted |
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| (adjective) without illumination | Synonyms: lightless, unilluminated, unlighted |
| unliterary | (adjective) marked by lack of affectation or pedantry | Synonyms: nonliterary |
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| unlittered | (adjective) having nothing extraneous | Synonyms: uncluttered |
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| unlivable | (adjective) unfit or unsuitable to live in or with | Synonyms: unliveable |
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| unliveable | (adjective) unfit or unsuitable to live in or with | Synonyms: unlivable |
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| unliveried | (adjective) not wearing livery | - |
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| unloaded | (adjective) (of weapons) not charged with ammunition | - |
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| unlobed | (adjective) without lobes | - |
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| unlocated | (adjective) lacking a particular location | - |
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| unlocked | (adjective) not firmly fastened or secured | Synonyms: unbarred, unbolted, unlatched, unsecured |
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| unlogical | (adjective) lacking in correct logical relation | Synonyms: illogical |
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| unlovable | (adjective) incapable of inspiring love or affection | - |
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| unloved | (adjective) not loved | - |
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| unlovely | (adjective) without beauty or charm | Synonyms: unpicturesque |
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| unloving | (adjective) not giving or reciprocating affection | - |
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| unlubricated | (adjective) not lubricated | Synonyms: ungreased |
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| unlucky | (adjective) having or bringing misfortune | Synonyms: luckless |
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| (adjective) marked by or promising bad fortune | Synonyms: doomed, ill-fated, ill-omened, ill-starred |
| unmade | (adjective) (of a bed) not having the sheets and blankets set in order | - |
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| unmalicious | (adjective) not malicious or spiteful | - |
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| unmalleable | (adjective) difficult or impossible to shape or work | - |
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| unmalted | (adjective) of grain that has not been converted into malt | - |
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| unmanageable | (adjective) hard to control | Synonyms: difficult |
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| (adjective) difficult to use or handle or manage because of size or weight or shape | Synonyms: unwieldy |
| (adjective) incapable of being controlled or managed | Synonyms: uncontrollable, uncorrectable |
| (adjective) difficult to solve or alleviate | Synonyms: uncontrollable |
| unmanful | (adjective) not possessing qualities befitting a man | Synonyms: unmanlike, unmanly |
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| unmanlike | (adjective) not possessing qualities befitting a man | Synonyms: unmanful, unmanly |
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| unmanly | (adjective) not possessing qualities befitting a man | Synonyms: unmanful, unmanlike |
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| (adjective) lacking in courage and manly strength and resolution; contemptibly fearful | Synonyms: poor-spirited, pusillanimous |
| unmanned | (adjective) lacking a crew | Synonyms: remote-controlled |
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| unmannered | (adjective) socially incorrect in behavior | Synonyms: bad-mannered, ill-mannered, rude, unmannerly |
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| (adjective) without artificiality; natural | - |
| unmannerly | (adjective) socially incorrect in behavior | Synonyms: bad-mannered, ill-mannered, rude, unmannered |
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| unmapped | (adjective) (of unknown regions) not yet surveyed or investigated | Synonyms: chartless, uncharted |
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| unmarked | (adjective) not having an identifying mark | - |
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| (adjective) not taken into account | Synonyms: overlooked, unnoted |
| unmarketable | (adjective) not capable of being sold | - |
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| (adjective) not fit for sale | Synonyms: unmerchantable, unvendible |
| unmarred | (adjective) free from physical or moral spots or stains | Synonyms: unblemished, unmutilated |
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| unmarried | (adjective) not married or related to the unmarried state | Synonyms: single |
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| unmatchable | (adjective) eminent beyond or above comparison | Synonyms: matchless, nonpareil, one, one and only, peerless, unmatched, unrivaled, unrivalled |
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| unmatched | (adjective) eminent beyond or above comparison | Synonyms: matchless, nonpareil, one, one and only, peerless, unmatchable, unrivaled, unrivalled |
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| (adjective) of the remaining member of a pair | Synonyms: odd, unmated, unpaired |
| unmated | (adjective) not mated sexually | - |
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| (adjective) of the remaining member of a pair | Synonyms: odd, unmatched, unpaired |
| unmeaning | (adjective) without meaning | - |
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| unmeasurable | (adjective) impossible to measure | Synonyms: immeasurable, immensurable |
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| unmeasured | (adjective) without limits in extent or size or quantity | Synonyms: illimitable, limitless, measureless |
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| (adjective) not composed of measured syllables; not metrical | - |
| unmechanical | (adjective) (of a person) lacking mechanical skills | Synonyms: nonmechanical |
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| unmechanised | (adjective) not mechanized | Synonyms: unmechanized |
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| unmechanized | (adjective) not mechanized | Synonyms: unmechanised |
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| unmediated | (adjective) having no intervening persons, agents, conditions | Synonyms: direct |
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| unmedical | (adjective) not having a medicinal effect or not medically prescribed | Synonyms: nonmedicinal, unmedicative, unmedicinal |
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