| unchanging | (adjective) conforming to the same principles or course of action over time | - |
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| (adjective) showing little if any change | Synonyms: stable, static |
| uncharacteristic | (adjective) distinctive and not typical | - |
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| uncharged | (adjective) of a particle or body or system; having no charge | - |
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| uncharitable | (adjective) lacking love and generosity | - |
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| uncharted | (adjective) (of unknown regions) not yet surveyed or investigated | Synonyms: chartless, unmapped |
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| unchartered | (adjective) not chartered | - |
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| unchaste | (adjective) not chaste | - |
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| uncheckable | (adjective) incapable of being checked or restrained | - |
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| unchecked | (adjective) not restrained or controlled | Synonyms: unbridled, uncurbed, ungoverned |
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| uncheerful | (adjective) causing sad feelings of gloom and inadequacy | Synonyms: cheerless, depressing |
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| unchewable | (adjective) (of meat) full of sinews; especially impossible to chew | Synonyms: fibrous, sinewy, stringy |
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| unchivalrous | (adjective) offensively discourteous | Synonyms: caddish, ungallant |
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| unchristian | (adjective) not of a Christian faith | - |
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| unchristianly | (adjective) not becoming to or like a Christian | Synonyms: unchristlike |
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| unchristlike | (adjective) not becoming to or like a Christian | Synonyms: unchristianly |
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| uncial | (adjective) relating to or written in majuscule letters (which resemble modern capitals) | - |
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| uncivil | (adjective) lacking civility or good manners | Synonyms: rude |
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| uncivilised | (adjective) without civilizing influences | Synonyms: barbarian, barbaric, savage, uncivilized, wild |
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| uncivilized | (adjective) without civilizing influences | Synonyms: barbarian, barbaric, savage, uncivilised, wild |
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| unclad | (adjective) having removed clothing | Synonyms: unappareled, unattired, undressed, ungarbed, ungarmented |
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| unclaimed | (adjective) not claimed or called for by an owner or assignee | - |
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| unclassifiable | (adjective) not possible to classify | - |
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| unclassified | (adjective) not arranged in any specific grouping | - |
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| (adjective) not subject to a security classification | - |
| unclean | (adjective) having a physical or moral blemish so as to make impure according to dietary or ceremonial laws | Synonyms: impure |
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| (adjective) soiled or likely to soil with dirt or grime | Synonyms: dirty, soiled |
| uncleanly | (adjective) habitually unclean | - |
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| unclear | (adjective) not clear to the mind | - |
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| (adjective) poorly stated or described | Synonyms: ill-defined |
| (adjective) not easily deciphered | Synonyms: indecipherable, undecipherable, unreadable |
| uncleared | (adjective) not cleared; not rid of objects or obstructions | - |
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| unclimbable | (adjective) incapable of being ascended | Synonyms: unscalable |
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| (adjective) incapable of being surmounted or climbed | Synonyms: unsurmountable |
| unclipped | (adjective) not clipped | - |
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| unclogged | (adjective) freed of obstructions | - |
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| unclothed | (adjective) not wearing clothing | - |
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| unclouded | (adjective) not made opaque or cloudy by sediment | - |
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| (adjective) not mentally disordered | - |
| (adjective) (of sound or color) free from anything that dulls or dims | Synonyms: clean, clear, light |
| (adjective) free from clouds | Synonyms: cloudless |
| uncluttered | (adjective) having nothing extraneous | Synonyms: unlittered |
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| uncoated | (adjective) not having a coating | - |
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| uncoerced | (adjective) not brought about by coercion or force | Synonyms: unforced, willing |
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| uncoiled | (adjective) no longer coiled | Synonyms: straight |
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| uncollected | (adjective) not brought together in one place | Synonyms: ungathered |
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| uncollectible | (adjective) not capable of being collected | Synonyms: bad |
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| uncolored | (adjective) without color | Synonyms: uncoloured |
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| (adjective) not artificially colored or bleached | Synonyms: unbleached, undyed |
| uncoloured | (adjective) without color | Synonyms: uncolored |
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| uncolumned | (adjective) not having columns | Synonyms: noncolumned |
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| uncombable | (adjective) not capable of being combed | - |
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| uncombed | (adjective) (of hair) not combed | - |
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| uncombined | (adjective) not joined or united into one | - |
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| uncomely | (adjective) not in keeping with accepted standards of what is right or proper in polite society | Synonyms: indecent, indecorous, unbecoming, unseemly, untoward |
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| uncomfortable | (adjective) providing or experiencing physical discomfort | - |
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| (adjective) conducive to or feeling mental discomfort | - |
| uncommercial | (adjective) not conducive to commercial success | - |
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| uncommercialised | (adjective) not having been commercialized | Synonyms: uncommercialized |
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| uncommercialized | (adjective) not having been commercialized | Synonyms: uncommercialised |
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| uncommitted | (adjective) not bound or pledged | - |
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| (adjective) not associated in an exclusive sexual relationship | Synonyms: unattached |
| (adjective) not busy; not otherwise committed | Synonyms: available |
| uncommon | (adjective) not common or ordinarily encountered; unusually great in amount or remarkable in character or kind | - |
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| (adjective) marked by an uncommon quality; especially superlative or extreme of its kind | Synonyms: rare |
| uncommunicative | (adjective) not inclined to talk or give information or express opinions | Synonyms: incommunicative |
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| uncomparable | (adjective) such that comparison is impossible; unsuitable for comparison or lacking features that can be compared | Synonyms: incomparable |
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| uncompartmented | (adjective) not compartmented; not divided into compartments or isolated units | - |
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| uncompassionate | (adjective) lacking compassion or feeling for others | - |
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| uncompensated | (adjective) not paying a salary | Synonyms: unsalaried |
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| uncompetitive | (adjective) not inclined to compete | - |
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| uncomplaining | (adjective) not complaining | - |
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| uncomplete | (adjective) not complete or total; not completed | Synonyms: incomplete |
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| uncompleted | (adjective) not caught or not caught within bounds | - |
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| (adjective) not yet finished | Synonyms: incomplete |
| uncomplicated | (adjective) easy and not involved or complicated | Synonyms: elementary, simple, unproblematic |
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| (adjective) lacking complexity | Synonyms: unsophisticated |
| uncomplimentary | (adjective) tending to (or intended to) detract or disparage | - |
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| (adjective) showing or representing unfavorably | Synonyms: unflattering |
| uncompounded | (adjective) not constituting a compound | Synonyms: unmixed |
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| uncomprehended | (adjective) not fully understood | - |
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| uncomprehending | (adjective) lacking understanding | - |
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| 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 |