| uncomparable | (adjective) such that comparison is impossible; unsuitable for comparison or lacking features that can be compared | Synonyms: incomparable |
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| unconformable | (adjective) not correspondent | - |
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| unconquerable | (adjective) not capable of being conquered or vanquished or overcome | - |
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| (adjective) incapable of being surmounted or excelled | Synonyms: insuperable |
| unconscionable | (adjective) greatly exceeding bounds of reason or moderation | Synonyms: exorbitant, extortionate, outrageous, steep, usurious |
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| (adjective) lacking a conscience | Synonyms: conscienceless |
| unconsolable | (adjective) sad beyond comforting; incapable of being consoled | Synonyms: disconsolate, inconsolable |
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| uncontrollable | (adjective) incapable of being controlled or managed | Synonyms: uncorrectable, unmanageable |
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| (adjective) difficult to solve or alleviate | Synonyms: unmanageable |
| (adjective) impossible to repress or control | Synonyms: irrepressible |
| (adjective) incapable of being controlled | Synonyms: indocile, ungovernable, unruly |
| uncorrectable | (adjective) incapable of being controlled or managed | Synonyms: uncontrollable, unmanageable |
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| uncultivable | (adjective) not suitable for cultivation or tilling | Synonyms: uncultivatable |
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| uncultivatable | (adjective) not suitable for cultivation or tilling | Synonyms: uncultivable |
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| undatable | (adjective) not capable of being given a date | - |
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| undecideable | (adjective) not capable of being decided as following or not following from the axioms of a logical system | - |
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| undecipherable | (adjective) not easily deciphered | Synonyms: indecipherable, unclear, unreadable |
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| undecomposable | (adjective) representing the furthest possible extent of analysis or division into parts | Synonyms: unanalyzable |
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| undefendable | (adjective) not defended or capable of being defended | Synonyms: assailable, open, undefended |
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| undefinable | (adjective) not capable of being precisely or readily described; not easily put into words | Synonyms: indefinable |
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| undeniable | (adjective) not possible to deny | - |
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| undependable | (adjective) not worthy of reliance or trust | Synonyms: unreliable |
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| (adjective) liable to be erroneous or misleading | Synonyms: unreliable |
| understandable | (adjective) capable of being apprehended or understood | Synonyms: apprehensible, graspable, intelligible, perceivable |
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| undesirable | (adjective) not wanted | Synonyms: unwanted |
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| (adjective) not worthy of being chosen (especially as a spouse) | Synonyms: unsuitable |
| (noun) one whose presence is undesirable | - |
| undestroyable | (adjective) very long lasting | Synonyms: durable, indestructible, perdurable |
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| (adjective) not capable of being destroyed | - |
| undetectable | (adjective) barely able to be perceived | Synonyms: indiscernible, insensible |
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| (adjective) not easily seen | - |
| undeterminable | (adjective) not capable of being definitely decided or ascertained | Synonyms: indeterminable |
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| undiagnosable | (adjective) not possible to diagnose | - |
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| undiscoverable | (adjective) not able to be ascertained; resisting discovery | Synonyms: unascertainable |
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| undisputable | (adjective) not open to question; obviously true | Synonyms: incontestable, indisputable |
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| undistinguishable | (adjective) not capable of being distinguished or differentiated | Synonyms: indistinguishable |
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| undividable | (adjective) cannot be divided without leaving a remainder | Synonyms: indivisible by |
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| undoable | (adjective) impossible to achieve | Synonyms: unachievable, unattainable, unrealizable |
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| undrinkable | (adjective) unsuitable for drinking | - |
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| uneatable | (adjective) not suitable for food | Synonyms: inedible |
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| unemployable | (adjective) not acceptable for employment as a worker | - |
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| unendurable | (adjective) incapable of being tolerated or endured | Synonyms: intolerable, unbearable |
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| unenforceable | (adjective) not enforceable; not capable of being brought about by compulsion | - |
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| unenviable | (adjective) hard to deal with; especially causing pain or embarrassment | Synonyms: awkward, embarrassing, sticky |
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| (adjective) so undesirable as to be incapable of arousing envy | - |
| unerasable | (adjective) cannot be removed or erased | Synonyms: indelible |
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| unexceptionable | (adjective) completely acceptable; not open to exception or reproach | Synonyms: unimpeachable |
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| unexchangeable | (adjective) not suitable to be exchanged | - |
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| (adjective) used especially of currencies; incapable of being exchanged for or replaced by another currency of equal value | Synonyms: inconvertible, unconvertible |
| unexcitable | (adjective) not easily excited | - |
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| unexpendable | (adjective) not suitable to be expended | - |
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| unexplainable | (adjective) not to be accounted for or explained | Synonyms: unaccountable |
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| unexportable | (adjective) not suitable for export | - |
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| unfashionable | (adjective) not in accord with or not following current fashion | Synonyms: unstylish |
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| (adjective) unpopular and considered unappealing or unfashionable at the time | Synonyms: out of fashion |
| unfathomable | (adjective) of depth; not capable of being sounded or measured | - |
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| (adjective) resembling an abyss in depth; so deep as to be unmeasurable | Synonyms: abysmal, abyssal |
| (adjective) incapable of being fully understood | - |
| unfavorable | (adjective) (of winds or weather) tending to hinder or oppose | Synonyms: unfavourable |
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| (adjective) not encouraging or approving or pleasing | Synonyms: unfavourable |
| (adjective) involving or creating circumstances detrimental to success or effectiveness | Synonyms: disadvantageous, unfavourable |
| unfavourable | (adjective) (of winds or weather) tending to hinder or oppose | Synonyms: unfavorable |
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| (adjective) not encouraging or approving or pleasing | Synonyms: unfavorable |
| (adjective) involving or creating circumstances detrimental to success or effectiveness | Synonyms: disadvantageous, unfavorable |
| unflappable | (adjective) not easily perturbed or excited or upset; marked by extreme calm and composure | Synonyms: imperturbable |
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| unforeseeable | (adjective) incapable of being anticipated | - |
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| unforfeitable | (adjective) not subject to forfeiture | Synonyms: inalienable |
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| unforgettable | (adjective) impossible to forget | - |
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| unforgivable | (adjective) not excusable | Synonyms: inexcusable |
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| ungetatable | (adjective) difficult to reach or attain | Synonyms: un-come-at-able, un-get-at-able |
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| ungovernable | (adjective) incapable of being controlled | Synonyms: indocile, uncontrollable, unruly |
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| unhearable | (adjective) impossible to hear; imperceptible by the ear | Synonyms: inaudible |
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| unidentifiable | (adjective) impossible to identify | - |
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| unimaginable | (adjective) totally unlikely | Synonyms: impossible, inconceivable, out of the question |
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| unimpeachable | (adjective) completely acceptable; not open to exception or reproach | Synonyms: unexceptionable |
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| (adjective) free of guilt; not subject to blame | Synonyms: blameless, inculpable, irreproachable |
| (adjective) beyond doubt or reproach | - |
| unimpressionable | (adjective) not sensitive or susceptible to impression | - |
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| uninhabitable | (adjective) not fit for habitation | - |
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| uninjectable | (adjective) (used of drugs) not capable of being injected | - |
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| uninsurable | (adjective) not capable of being insured or not eligible to be insured | - |
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| unjustifiable | (adjective) incapable of being justified or explained | Synonyms: indefensible, insupportable, unwarrantable, unwarranted |
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| unknowable | (adjective) not knowable | - |
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| unknowledgeable | (adjective) unaware because of a lack of relevant information or knowledge | Synonyms: ignorant, unknowing, unwitting |
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| 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 |
| 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 |
| 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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| unlovable | (adjective) incapable of inspiring love or affection | - |
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| unmalleable | (adjective) difficult or impossible to shape or work | - |
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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 |
| unmarketable | (adjective) not capable of being sold | - |
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| (adjective) not fit for sale | Synonyms: unmerchantable, unvendible |
| unmatchable | (adjective) eminent beyond or above comparison | Synonyms: matchless, nonpareil, one, one and only, peerless, unmatched, unrivaled, unrivalled |
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| unmeasurable | (adjective) impossible to measure | Synonyms: immeasurable, immensurable |
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| unmemorable | (adjective) not worth remembering | - |
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| unmentionable | (adjective) unsuitable or forbidden as a topic of conversation | - |
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| (noun) a garment worn under other garments | Synonyms: undergarment |
| unmerchantable | (adjective) not fit for sale | Synonyms: unmarketable, unvendible |
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| unmistakable | (adjective) clearly evident to the mind | - |
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| (adjective) clearly revealed to the mind or the senses or judgment | Synonyms: apparent, evident, manifest, palpable, patent, plain |
| unmitigable | (adjective) incapable of being mitigated | - |
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| unmixable | (adjective) (chemistry, physics) incapable of mixing | Synonyms: immiscible, non-miscible |
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| unmodifiable | (adjective) incapable of being modified in form or character or strength (especially by making less extreme) | - |
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| unmovable | (adjective) not able or intended to be moved | Synonyms: immovable, immoveable, stabile |
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| unnameable | (adjective) too sacred to be uttered | Synonyms: ineffable, unspeakable, unutterable |
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| unnavigable | (adjective) incapable of being navigated | - |
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| unnoticeable | (adjective) not noticeable; not drawing attention | - |
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| (adjective) not drawing attention | Synonyms: obscure |
| unnumberable | (adjective) too numerous to be counted | Synonyms: countless, infinite, innumerable, innumerous, multitudinous, myriad, numberless, uncounted, unnumbered, unnumerable |
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| unnumerable | (adjective) too numerous to be counted | Synonyms: countless, infinite, innumerable, innumerous, multitudinous, myriad, numberless, uncounted, unnumberable, unnumbered |
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| unobjectionable | (adjective) (of behavior or especially language) free from objectionable elements; fit for all observers | Synonyms: clean |
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| (adjective) not objectionable | - |
| (adjective) not causing disapproval | Synonyms: innocuous |
| unobservable | (adjective) not accessible to direct observation | - |
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| unobtainable | (adjective) not capable of being obtained | Synonyms: inaccessible, unprocurable, untouchable |
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| unopposable | (adjective) not opposable | - |
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| unpaintable | (adjective) not paintable especially not suitable for artistic representation on canvas | - |
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| unpalatable | (adjective) not pleasant or acceptable to the taste or mind | - |
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| unpardonable | (adjective) not admitting of pardon | - |
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| unpassable | (adjective) incapable of being passed | Synonyms: impassable |
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| unpeaceable | (adjective) not disposed to peace | - |
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| unperceivable | (adjective) impossible or difficult to perceive by the mind or senses | Synonyms: imperceptible |
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| unpersuadable | (adjective) not susceptible to persuasion | Synonyms: unsuasible |
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| unplayable | (adjective) not capable of or suitable for being played or played on | - |
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| unportable | (adjective) not portable; not easily moved or transported | - |
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| unpredictable | (adjective) not capable of being foretold | - |
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| (adjective) unknown in advance | - |
| (adjective) not occurring at a regular rate or fixed intervals | Synonyms: irregular |