| unreformable | (adjective) unrepentant and incapable of being reformed | Synonyms: unregenerate |
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| (adjective) insusceptible of reform | Synonyms: irreclaimable, irredeemable, unredeemable |
| unreliable | (adjective) not worthy of reliance or trust | Synonyms: undependable |
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| (adjective) dangerously unstable and unpredictable | Synonyms: treacherous |
| (adjective) liable to be erroneous or misleading | Synonyms: undependable |
| (adjective) lacking a sense of responsibility | - |
| unremarkable | (adjective) found in the ordinary course of events | Synonyms: everyday, mundane, quotidian, routine, workaday |
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| unrenewable | (adjective) that can not be renewed | Synonyms: nonrenewable |
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| unrentable | (adjective) not able or fit to be rented | - |
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| unrepeatable | (adjective) not able or fit to be repeated or quoted | Synonyms: unquotable |
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| (adjective) unique | - |
| unreplaceable | (adjective) impossible to replace | Synonyms: irreplaceable |
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| unreportable | (adjective) (of income) not reportable; not required by law to be reported | - |
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| unresolvable | (adjective) not capable of being resolved | - |
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| (adjective) not easily solved | Synonyms: insolvable, unsoluble, unsolvable |
| unrespectable | (adjective) unworthy of respect | - |
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| unretrievable | (adjective) impossible to recover or recoup or overcome | Synonyms: irretrievable |
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| unsalable | (adjective) impossible to sell | Synonyms: unsaleable |
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| unsaleable | (adjective) impossible to sell | Synonyms: unsalable |
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| unsatiable | (adjective) impossible to satisfy | Synonyms: insatiable, insatiate |
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| unsatisfiable | (adjective) not capable of being satisfied | - |
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| unscalable | (adjective) incapable of being ascended | Synonyms: unclimbable |
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| unseasonable | (adjective) not in keeping with (and usually undesirable for) the season | - |
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| (adjective) badly timed | Synonyms: ill-timed, untimely, wrong |
| unseeable | (adjective) impossible or nearly impossible to see; imperceptible by the eye | Synonyms: invisible |
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| unserviceable | (adjective) not ready for service | - |
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| (adjective) not capable of being used | Synonyms: unusable, unuseable |
| unshakable | (adjective) without flaws or loopholes | Synonyms: bulletproof, ironclad, unassailable, watertight |
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| (adjective) marked by firm determination or resolution; not shakable | Synonyms: firm, steadfast, steady, stiff, unbendable, unfaltering, unwavering |
| unshockable | (adjective) incapable of being shocked | Synonyms: broad-minded |
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| unshrinkable | (adjective) incapable of being shrunk or diminished or reduced | - |
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| unsinkable | (adjective) incapable of being sunk | - |
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| unsociable | (adjective) not inclined to society or companionship | - |
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| unsolvable | (adjective) not easily solved | Synonyms: insolvable, unresolvable, unsoluble |
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| unsoundable | (adjective) too deep to determine the depth of | - |
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| unspeakable | (adjective) exceptionally bad or displeasing | Synonyms: abominable, atrocious, awful, dreadful, painful, terrible |
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| (adjective) defying expression or description | Synonyms: indefinable, indescribable, ineffable, untellable, unutterable |
| (adjective) too sacred to be uttered | Synonyms: ineffable, unnameable, unutterable |
| unstable | (adjective) lacking stability or fixity or firmness | - |
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| (adjective) subject to change; variable | Synonyms: fluid |
| (adjective) suffering from severe mental illness | Synonyms: mentally ill, unsound |
| (adjective) disposed to psychological variability | - |
| (adjective) highly or violently reactive | - |
| (adjective) affording no ease or reassurance | Synonyms: precarious |
| unstoppable | (adjective) not capable of being stopped | - |
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| unsubduable | (adjective) impossible to subdue | Synonyms: indomitable, never-say-die |
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| unsufferable | (adjective) too extreme to bear | Synonyms: insufferable |
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| unsuitable | (adjective) not conducive to good moral development | - |
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| (adjective) not worthy of being chosen (especially as a spouse) | Synonyms: undesirable |
| (adjective) not meant or adapted for a particular purpose | - |
| (adjective) not capable of being applied | Synonyms: inapplicable |
| unsupportable | (adjective) not able to be supported or defended | - |
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| unsurmountable | (adjective) not capable of being surmounted or overcome | Synonyms: insurmountable |
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| (adjective) incapable of being surmounted or climbed | Synonyms: unclimbable |
| unsurpassable | (adjective) not to be exceeded | - |
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| untellable | (adjective) defying expression or description | Synonyms: indefinable, indescribable, ineffable, unspeakable, unutterable |
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| untenable | (adjective) (of theories etc) incapable of being defended or justified | Synonyms: indefensible |
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| unthinkable | (adjective) incapable of being conceived or considered | - |
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| untouchable | (adjective) forbidden to the touch | - |
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| (adjective) impossible to assail | Synonyms: unassailable |
| (adjective) beyond the reach of criticism or attack or impeachment | - |
| (adjective) not capable of being obtained | Synonyms: inaccessible, unobtainable, unprocurable |
| (adjective) (especially used in traditional Hindu belief of the lowest caste or castes) defiling | - |
| untraceable | (adjective) incapable of being traced or tracked down | - |
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| untransferable | (adjective) incapable of being transferred | Synonyms: nontransferable, unassignable |
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| untranslatable | (adjective) not capable of being put into another form or style or language | - |
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| untransmutable | (adjective) not capable of being changed into something else | Synonyms: inconvertible |
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| untraversable | (adjective) incapable of being traversed | - |
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| unusable | (adjective) not capable of being used | Synonyms: unserviceable, unuseable |
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| unuseable | (adjective) not capable of being used | Synonyms: unserviceable, unusable |
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| unutterable | (adjective) defying expression or description | Synonyms: indefinable, indescribable, ineffable, unspeakable, untellable |
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| (adjective) too sacred to be uttered | Synonyms: ineffable, unnameable, unspeakable |
| (adjective) very difficult to pronounce correctly | Synonyms: unpronounceable |
| unvanquishable | (adjective) incapable of being overcome or subdued | Synonyms: invincible, unbeatable |
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| unverifiable | (adjective) (of e.g. evidence) not objective or easily verified | Synonyms: unobjective |
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| unwarrantable | (adjective) incapable of being justified or explained | Synonyms: indefensible, insupportable, unjustifiable, unwarranted |
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| unwearable | (adjective) not suitable for wear or able to be worn | - |
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| unworkable | (adjective) not capable of being carried out or put into practice | Synonyms: impracticable, infeasible, unfeasible |
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| usable | (adjective) convenient for use or disposal | Synonyms: available, useable |
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| (adjective) fit or ready for use or service | Synonyms: functional, operable, operational, useable |
| (adjective) capable of being put to use | Synonyms: useable |
| useable | (adjective) convenient for use or disposal | Synonyms: available, usable |
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| (adjective) fit or ready for use or service | Synonyms: functional, operable, operational, usable |
| (adjective) capable of being put to use | Synonyms: usable |
| utilizable | (adjective) capable of being put to a profitable or practical use | - |
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| utterable | (adjective) capable of being uttered in words or sentences | Synonyms: speakable |
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| valuable | (adjective) having great material or monetary value especially for use or exchange | - |
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| (adjective) having worth or merit or value | Synonyms: worthful |
| vanquishable | (adjective) susceptible to being defeated | Synonyms: beatable, vincible |
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| vaporizable | (adjective) (used of substances) capable of being volatilized | Synonyms: evaporable, vaporific, vapourific, vapourisable, volatilisable, volatilizable |
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| vapourisable | (adjective) (used of substances) capable of being volatilized | Synonyms: evaporable, vaporific, vaporizable, vapourific, volatilisable, volatilizable |
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| variable | (adjective) liable to or capable of change | - |
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| (adjective) (used of a device) designed so that a property (as e.g. light) can be varied | - |
| (adjective) marked by diversity or difference | Synonyms: varying |
| vendable | (adjective) fit to be offered for sale | Synonyms: marketable, merchantable, sellable, vendible |
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| venerable | (adjective) profoundly honored | Synonyms: august, revered |
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| (adjective) impressive by reason of age | - |
| verifiable | (adjective) capable of being tested (verified or falsified) by experiment or observation | Synonyms: confirmable, falsifiable |
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| (adjective) capable of being verified | - |
| veritable | (adjective) not counterfeit or copied | Synonyms: authentic, bona fide, unquestionable |
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| (adjective) often used as intensifiers | Synonyms: regular |
| viable | (adjective) capable of life or normal growth and development | - |
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| (adjective) capable of being done with means at hand and circumstances as they are | Synonyms: executable, feasible, practicable, workable |
| viewable | (adjective) capable of being viewed | - |
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| violable | (adjective) capable of being violated | - |
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| voidable | (adjective) capable of being rescinded or voided | Synonyms: rescindable |
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| volatilisable | (adjective) (used of substances) capable of being volatilized | Synonyms: evaporable, vaporific, vaporizable, vapourific, vapourisable, volatilizable |
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| volatilizable | (adjective) (used of substances) capable of being volatilized | Synonyms: evaporable, vaporific, vaporizable, vapourific, vapourisable, volatilisable |
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| vulnerable | (adjective) susceptible to attack | - |
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| (adjective) susceptible to criticism or persuasion or temptation | - |
| (adjective) capable of being wounded or hurt | - |
| washable | (adjective) capable of being washed without injury | - |
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| wearable | (adjective) suitable for wear or able to be worn | - |
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| workable | (adjective) capable of being done with means at hand and circumstances as they are | Synonyms: executable, feasible, practicable, viable |
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