| uncomprehensible | (adjective) difficult to understand | Synonyms: incomprehensible |
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| uncompromising | (adjective) not making concessions | Synonyms: inflexible, sturdy |
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| unconcealed | (adjective) not concealed or hidden | - |
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| unconcerned | (adjective) lacking in interest or care or feeling | - |
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| (adjective) not occupied or engaged with | - |
| (adjective) easy in mind; not worried | - |
| unconditional | (adjective) not conditional | Synonyms: unconditioned |
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| (adjective) not contingent; not determined or influenced by someone or something else | - |
| (adjective) not modified or restricted by reservations | Synonyms: categoric, categorical, flat |
| unconditioned | (adjective) not established by conditioning or learning | Synonyms: innate, unlearned |
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| (adjective) not conditional | Synonyms: unconditional |
| unconfessed | (adjective) not admitted | - |
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| unconfined | (adjective) not confined | - |
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| (adjective) free from confinement or physical restraint | Synonyms: unimprisoned |
| unconfirmed | (adjective) not finally established or settled | - |
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| unconformable | (adjective) not correspondent | - |
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| unconformist | (adjective) not conforming to some norm or socially approved pattern of behavior or thought | Synonyms: nonconformist |
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| unconfused | (adjective) not perplexed by conflicting situations or statements | Synonyms: unbaffled |
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| uncongenial | (adjective) not suitable to your tastes or needs | Synonyms: incompatible |
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| (adjective) used of plant stock or scions; incapable of being grafted | - |
| (adjective) very unfavorable to life or growth | Synonyms: hostile, unfriendly |
| unconnected | (adjective) not joined or linked together | - |
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| (adjective) lacking orderly continuity | Synonyms: confused, disconnected, disjointed, disordered, garbled, illogical, scattered |
| (adjective) not connected by birth or family | - |
| unconquerable | (adjective) not capable of being conquered or vanquished or overcome | - |
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| (adjective) incapable of being surmounted or excelled | Synonyms: insuperable |
| unconquered | (adjective) not conquered | Synonyms: unbeaten, unvanquished |
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| unconscientious | (adjective) not conscientious | - |
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| 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 |
| unconscious | (adjective) not conscious; lacking awareness and the capacity for sensory perception as if asleep or dead | - |
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| (adjective) without conscious volition | - |
| (adjective) (followed by `of') not knowing or perceiving | - |
| unconsecrated | (adjective) not holy because unconsecrated or impure or defiled | Synonyms: profane, unsanctified |
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| unconsidered | (adjective) without proper consideration or reflection | Synonyms: inconsiderate |
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| unconsolable | (adjective) sad beyond comforting; incapable of being consoled | Synonyms: disconsolate, inconsolable |
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| unconsolidated | (adjective) loose and unstratified | - |
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| unconstipated | (adjective) not constipated | Synonyms: regular |
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| unconstitutional | (adjective) not consistent with or according to a constitution; contrary to the U.S. Constitution | - |
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| unconstrained | (adjective) free from constraint | - |
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| unconstricted | (adjective) not constricted physically or by extension psychologically | - |
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| unconstructive | (adjective) not constructive | - |
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| unconsumed | (adjective) not consumed | - |
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| unconsummated | (adjective) not consummated (especially of a marriage) | - |
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| uncontaminated | (adjective) not corrupted by contact or association | - |
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| (adjective) free from admixture with noxious elements; clean | Synonyms: unpolluted |
| uncontaminating | (adjective) not spreading pollution or contamination; especially radioactive contamination | Synonyms: clean |
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| uncontested | (adjective) not disputed and not made the object of contention or competition | - |
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| uncontrived | (adjective) not by design or artifice; unforced and impromptu | Synonyms: unstudied |
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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 |
| uncontrolled | (adjective) not being under control; out of control | - |
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| uncontroversial | (adjective) not likely to arouse controversy | Synonyms: noncontroversial |
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| unconventional | (adjective) not conforming to accepted rules or standards | - |
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| (adjective) not conventional or conformist | - |
| (adjective) not conforming to legality, moral law, or social convention | Synonyms: improper, unlawful |
| unconverted | (adjective) not converted | Synonyms: unpersuaded |
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| unconvertible | (adjective) used especially of currencies; incapable of being exchanged for or replaced by another currency of equal value | Synonyms: inconvertible, unexchangeable |
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| unconvinced | (adjective) lacking conviction | - |
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| unconvincing | (adjective) not convincing | Synonyms: flimsy |
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| (adjective) having a probability too low to inspire belief | Synonyms: improbable, unbelievable, unlikely |
| uncooked | (adjective) not cooked | - |
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| uncool | (adjective) (spoken slang) unfashionable and boring | - |
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| uncooperative | (adjective) unwilling to cooperate | - |
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| (adjective) intentionally unaccommodating | Synonyms: disobliging |
| uncoordinated | (adjective) lacking the skillful and effective interaction of muscle movements | - |
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| (adjective) lacking in cooperative planning and organization | - |
| uncordial | (adjective) lacking warmth or friendliness | - |
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| uncorrectable | (adjective) incapable of being controlled or managed | Synonyms: uncontrollable, unmanageable |
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| uncorrected | (adjective) left faulty or wrong | - |
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| (adjective) not subjected to correction or discipline | Synonyms: undisciplined |
| uncorrelated | (adjective) not varying together | - |
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| uncorroborated | (adjective) unsupported by other evidence | Synonyms: unsubstantiated |
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| uncorrupted | (adjective) (of language) not having its purity or excellence debased | Synonyms: undefiled |
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| (adjective) not debased | - |
| (adjective) not decayed or decomposed | Synonyms: unspoiled |
| uncounted | (adjective) too numerous to be counted | Synonyms: countless, infinite, innumerable, innumerous, multitudinous, myriad, numberless, unnumberable, unnumbered, unnumerable |
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| uncoupled | (adjective) having the coupling undone | - |
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| uncousinly | (adjective) not befitting a cousin | - |
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| uncouth | (adjective) lacking refinement or cultivation or taste | Synonyms: coarse, common, rough-cut, vulgar |
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| uncovered | (adjective) not covered with clothing | Synonyms: exposed |
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| uncrannied | (adjective) without chinks or crannies | - |
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| uncreased | (adjective) used especially of fabrics | Synonyms: creaseless |
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| uncreative | (adjective) not creative | - |
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| uncritical | (adjective) not critical; not tending to find or call attention to errors | - |
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| (adjective) marked by disregard for critical standards or procedures | Synonyms: noncritical |
| uncropped | (adjective) not used for growing crops | - |
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| uncrossed | (adjective) not crossed | - |
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| (adjective) (of a check) not crossed | - |
| uncrowded | (adjective) having or allowing sufficient room | - |
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| uncrowned | (adjective) not (especially not yet) provided with a crown | Synonyms: crownless |
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| (adjective) not having an (artificial) crown on a tooth; used especially of molars and bicuspids | - |
| uncrystallised | (adjective) not finally or definitely formed | Synonyms: uncrystallized |
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| (adjective) without real or apparent crystalline form | Synonyms: amorphous, uncrystallized |
| uncrystallized | (adjective) not finally or definitely formed | Synonyms: uncrystallised |
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| (adjective) without real or apparent crystalline form | Synonyms: amorphous, uncrystallised |
| unctuous | (adjective) unpleasantly and excessively suave or ingratiating in manner or speech | Synonyms: buttery, fulsome, oily, oleaginous, smarmy, soapy |
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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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| uncultivated | (adjective) (of land or fields) not prepared for raising crops | - |
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| (adjective) characteristic of a person who is not cultivated or does not have intellectual tastes | Synonyms: lowbrow, lowbrowed |
| (adjective) (of persons) lacking art or knowledge | Synonyms: artless, uncultured |
| uncultured | (adjective) (of persons) lacking art or knowledge | Synonyms: artless, uncultivated |
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| uncurbed | (adjective) not restrained or controlled | Synonyms: unbridled, unchecked, ungoverned |
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| uncured | (adjective) not seasoned | - |
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| uncurled | (adjective) not having been curled | - |
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| (adjective) not curled | - |
| uncurtained | (adjective) not provided with curtains | Synonyms: curtainless |
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| uncurved | (adjective) having no curves | Synonyms: uncurving |
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| uncurving | (adjective) having no curves | Synonyms: uncurved |
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| uncut | (adjective) not cut | - |
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| (adjective) (of pages of a book) having adjacent leaves still joined at the fore edge | - |
| (adjective) not shaped by cutting or trimming | Synonyms: rough |
| (adjective) (used of grass or vegetation) not cut down with a hand implement or machine | Synonyms: unmown |
| (adjective) not trimmed | Synonyms: untrimmed |
| (adjective) complete | Synonyms: full-length |
| (adjective) not injured by cutting | - |
| undamaged | (adjective) not harmed or spoiled; sound | - |
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| undatable | (adjective) not capable of being given a date | - |
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| undated | (adjective) not bearing a date | Synonyms: dateless |
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| undaunted | (adjective) resolutely courageous | - |
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| (adjective) unshaken in purpose | Synonyms: undismayed, unshaken |
| undeceived | (adjective) freed of a mistaken or misguided notion | Synonyms: disabused |
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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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| undecided | (adjective) characterized by indecision | Synonyms: on the fence |
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| (adjective) not yet having made a commitment | - |
| (adjective) not brought to a conclusion; subject to further thought | Synonyms: open, undetermined, unresolved |
| undecipherable | (adjective) not easily deciphered | Synonyms: indecipherable, unclear, unreadable |
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| undeciphered | (adjective) not deciphered | - |
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| undeclared | (adjective) not announced or openly acknowledged | - |
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| undecomposable | (adjective) representing the furthest possible extent of analysis or division into parts | Synonyms: unanalyzable |
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| undecomposed | (adjective) not decayed | Synonyms: incorrupt |
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| undecorated | (adjective) not decorated with something to increase its beauty or distinction | Synonyms: unadorned |
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| undedicated | (adjective) not dedicated | - |
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| undefeated | (adjective) victorious | - |
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| undefendable | (adjective) not defended or capable of being defended | Synonyms: assailable, open, undefended |
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| undefended | (adjective) not defended or capable of being defended | Synonyms: assailable, open, undefendable |
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| undeferential | (adjective) not showing courteous respect | - |
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| undefiled | (adjective) (of language) not having its purity or excellence debased | Synonyms: uncorrupted |
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| (adjective) free from stain or blemish | Synonyms: immaculate |
| undefinable | (adjective) not capable of being precisely or readily described; not easily put into words | Synonyms: indefinable |
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| undefined | (adjective) not precisely limited, determined, or distinguished | Synonyms: vague |
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