| unarbitrary | (adjective) not subject to individual determination | Synonyms: nonarbitrary |
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| unarguable | (adjective) against which no argument can be made | Synonyms: inarguable |
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| unarguably | (adverb) in an unarguable and undisputed manner | Synonyms: inarguably, undisputedly |
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| unargumentative | (adjective) not given to or characterized by argument | - |
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| unarm | (verb) take away the weapons from; render harmless | Synonyms: disarm |
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| unarmed | (adjective) (used of persons or the military) not having or using arms | - |
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| (adjective) (used of plants or animals) lacking barbs or stings or thorns | - |
| unarmored | (adjective) (used of persons or things military) without protective armor | Synonyms: unarmoured |
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| (adjective) used of animals; without protective covering | Synonyms: unarmoured |
| unarmoured | (adjective) (used of persons or things military) without protective armor | Synonyms: unarmored |
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| (adjective) used of animals; without protective covering | Synonyms: unarmored |
| unarticulate | (adjective) without or deprived of the use of speech or words | Synonyms: inarticulate |
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| unarticulated | (adjective) not consisting of segments that are held together by joints | - |
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| (adjective) uttered without the use of normal words or syllables | - |
| unartistic | (adjective) lacking aesthetic sensibility | Synonyms: inartistic |
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| unary | (adjective) consisting of or involving a single element or component | - |
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| (noun) the bijective base-1 numeral system: in order to represent a number N, an arbitrarily chosen symbol representing 1 is repeated N times. | Synonyms: unary numeral system |
| unascertainable | (adjective) not able to be ascertained; resisting discovery | Synonyms: undiscoverable |
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| unascribable | (adjective) not attributable | Synonyms: unattributable |
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| 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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| unasked | (adjective) uninvited | - |
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| unassailable | (adjective) without flaws or loopholes | Synonyms: bulletproof, ironclad, unshakable, watertight |
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| (adjective) impossible to assail | Synonyms: untouchable |
| (adjective) immune to attack; incapable of being tampered with | Synonyms: impregnable, inviolable, secure, strong, unattackable |
| unassailably | (adverb) in an unalterable and unchangeable manner | Synonyms: immutably, unalterably, unchangeably |
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| unassertive | (adjective) inclined to timidity or lack of self-confidence | - |
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| unassertively | (adverb) in an unassertive manner | - |
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| unassertiveness | (noun) diffidence about self promotion | - |
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| unassignable | (adjective) incapable of being transferred | Synonyms: nontransferable, untransferable |
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| unassigned | (adjective) not assigned | - |
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| unassisted | (adjective) lacking help | - |
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| (adjective) unsupported by other people | Synonyms: single-handed, unbacked |
| unassuming | (adjective) not arrogant or presuming | Synonyms: retiring |
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| unassumingly | (adverb) in an unassuming manner | - |
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| unassumingness | (noun) a quality of naturalness and simplicity | Synonyms: sincerity |
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| unassured | (adjective) lacking boldness or confidence | - |
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| unasterisked | (adjective) not marked with an asterisk | Synonyms: unstarred |
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| unattached | (adjective) not associated in an exclusive sexual relationship | Synonyms: uncommitted |
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| (adjective) not fastened together | - |
| (adjective) (of animals) able to swim about; not attached | Synonyms: free-swimming |
| unattackable | (adjective) immune to attack; incapable of being tampered with | Synonyms: impregnable, inviolable, secure, strong, unassailable |
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| unattainability | (noun) The fact of being unattainable, of not being able to be reached or acquired. | - |
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| unattainable | (adjective) impossible to achieve | Synonyms: unachievable, undoable, unrealizable |
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| unattainableness | (noun) the state of being unattainable | - |
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| unattainably | (adverb) in an unattainable manner or to an unattainable degree | Synonyms: unachievably |
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| unattended | (adjective) lacking accompaniment or a guard or escort | - |
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| (adjective) lacking a caretaker | Synonyms: neglected |
| (adjective) not watched | - |
| unattired | (adjective) having removed clothing | Synonyms: unappareled, unclad, undressed, ungarbed, ungarmented |
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| unattractive | (adjective) lacking beauty or charm | - |
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| (adjective) lacking power to arouse interest | - |
| (adjective) not appealing to the senses | Synonyms: untempting |
| unattractively | (adverb) in an unattractive manner | - |
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| unattractiveness | (noun) an ugliness of appearance that is not appealing to viewers | - |
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| unattributable | (adjective) not attributable | Synonyms: unascribable |
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| unau | (noun) relatively small fast-moving sloth with two long claws on each front foot | Synonyms: Choloepus didactylus, two-toed sloth, unai |
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| (noun) a sloth of Central America that has two long claws on each forefoot and three long claws on each hindfoot | Synonyms: Choloepus hoffmanni, two-toed sloth, unai |
| unauthentic | (adjective) false or fake; not what it appears to be | Synonyms: inauthentic, spurious |
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| unauthorised | (adjective) not endowed with authority | Synonyms: unauthorized |
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| (adjective) without official authorization | Synonyms: unauthorized, wildcat |
| unauthorized | (adjective) not endowed with authority | Synonyms: unauthorised |
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| (adjective) without official authorization | Synonyms: unauthorised, wildcat |
| unavailability | (noun) the quality of not being available when needed | - |
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| unavailable | (adjective) not available or accessible or at hand | - |
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| unavailing | (adjective) producing no result or effect | Synonyms: futile, ineffectual, meaningless, otiose |
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| unavenged | (adjective) for which vengeance has not been taken | - |
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| unavoidability | (noun) the quality of being impossible to avoid or evade | Synonyms: ineluctability |
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| unavoidable | (adjective) impossible to avoid or evade | Synonyms: ineluctable, inescapable |
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| unavoidably | (adverb) by necessity | Synonyms: ineluctably, inescapably, inevitably |
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| unavowed | (adjective) not openly expressed | Synonyms: sneaking |
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| (adjective) not openly made known | Synonyms: secret |
| (adjective) not affirmed or mentioned or declared | - |
| unawakened | (adjective) not aroused or activated | - |
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| (adjective) still asleep | - |
| unaware | (adjective) (often followed by `of') not aware | Synonyms: incognizant |
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| unawareness | (noun) unconsciousness resulting from lack of knowledge or attention | Synonyms: unknowingness |
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| unawares | (adverb) suddenly and unexpectedly | - |
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| (adverb) without forethought or plan; inadvertently | - |
| (adverb) at a disadvantage | Synonyms: short |
| unawed | (adjective) not awed | - |
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