| unhealthy | (adjective) not in or exhibiting good health in body or mind | - |
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| (adjective) not conducive to good health | - |
| (adjective) detrimental to health | Synonyms: insalubrious, unhealthful |
| unhearable | (adjective) impossible to hear; imperceptible by the ear | Synonyms: inaudible |
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| unheard | (adjective) not necessarily inaudible but not heard | - |
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| unhearing | (adjective) totally deaf; unable to hear anything | Synonyms: deaf as a post, profoundly deaf, stone-deaf |
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| unheated | (adjective) not having been heated or warmed | Synonyms: unwarmed |
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| unheeded | (adjective) disregarded | Synonyms: ignored, neglected |
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| unheeding | (adjective) marked by or paying little heed or attention | Synonyms: heedless |
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| unhelpful | (adjective) providing no assistance | - |
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| unheralded | (adjective) without warning or announcement | Synonyms: unannounced, unpredicted |
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| unhesitating | (adjective) characterized by quickness and firmness | Synonyms: resolute |
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| unhewn | (adjective) (of stone especially) not given a finished form by or as if by hewing | - |
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| unhindered | (adjective) not slowed or blocked or interfered with | Synonyms: unhampered |
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| unhinged | (adjective) affected with madness or insanity | Synonyms: brainsick, crazy, demented, disturbed, mad, sick, unbalanced |
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| unholy | (adjective) not hallowed or consecrated | Synonyms: unhallowed |
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| (adjective) extremely evil or cruel; expressive of cruelty or befitting hell | Synonyms: demonic, diabolic, diabolical, fiendish, hellish, infernal, satanic |
| (adjective) having committed unrighteous acts | Synonyms: sinful, wicked |
| unhomogenised | (adjective) not having undergone homogenization | Synonyms: unhomogenized |
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| unhomogenized | (adjective) not having undergone homogenization | Synonyms: unhomogenised |
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| unhoped | (adjective) so unexpected as to have not been imagined | Synonyms: unhoped-for, unthought-of, unthought |
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| unhopeful | (adjective) showing utter resignation or hopelessness | Synonyms: abject |
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| unhuman | (adjective) divested of human qualities or attributes | Synonyms: dehumanised, dehumanized |
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| unhumorous | (adjective) lacking humor | Synonyms: humorless, humourless |
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| unhurried | (adjective) relaxed and leisurely; without hurry or haste | - |
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| (adjective) capable of accepting delay with equanimity | - |
| unhurt | (adjective) free from danger or injury | Synonyms: safe and sound |
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| (adjective) not injured or harmed | Synonyms: unharmed, unscathed, whole |
| unhygienic | (adjective) unclean and constituting a likely cause of disease | - |
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| unicameral | (adjective) composed of one legislative body | - |
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| unicellular | (adjective) having or consisting of a single cell | - |
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| unicuspid | (adjective) having a single cusp or point | - |
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| unidentifiable | (adjective) impossible to identify | - |
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| unidentified | (adjective) being or having an unknown or unnamed source | Synonyms: nameless, unknown, unnamed |
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| (adjective) not yet identified | - |
| unidimensional | (adjective) relating to a single dimension or aspect; having no depth or scope | Synonyms: one-dimensional |
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| unidirectional | (adjective) operating or moving or allowing movement in one direction only | - |
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| unifacial | (adjective) having but one principal or specialized surface | - |
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| unified | (adjective) operating as a unit | Synonyms: co-ordinated, coordinated, interconnected |
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| (adjective) formed or united into a whole | Synonyms: incorporate, incorporated, integrated, merged |
| unifilar | (adjective) having or using only one filament | - |
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| unifoliate | (adjective) having a single leaf | - |
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| uniform | (adjective) always the same; showing a single form or character in all occurrences | Synonyms: unvarying |
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| (adjective) not differentiated | Synonyms: undifferentiated |
| (adjective) the same throughout in structure or composition | Synonyms: consistent |
| (adjective) evenly spaced | - |
| uniformed | (adjective) dressed in a uniform | - |
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| unifying | (adjective) tending to unify | Synonyms: centripetal |
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| (adjective) combining into a single unit | Synonyms: consolidative |
| unilateral | (adjective) involving only one part or side | Synonyms: one-sided |
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| (adjective) tracing descent from either the paternal or the maternal line only | - |
| unilluminated | (adjective) without illumination | Synonyms: lightless, unlighted, unlit |
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| unilluminating | (adjective) failing to inform or clarify | Synonyms: unenlightening |
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| unimaginable | (adjective) totally unlikely | Synonyms: impossible, inconceivable, out of the question |
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| unimaginative | (adjective) lacking spontaneity or originality or individuality | Synonyms: stereotyped, stereotypic, stereotypical |
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| (adjective) dealing only with concrete facts | - |
| (adjective) deficient in originality or creativity; lacking powers of invention | Synonyms: sterile, uninspired, uninventive |
| unimagined | (adjective) not imagined even in a dream | Synonyms: undreamed, undreamed of, undreamt, undreamt of |
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| unimodal | (adjective) having a single mode | - |
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| unimpaired | (adjective) not damaged or diminished in any respect | - |
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| unimpassioned | (adjective) free from emotional appeal; marked by reasonableness | - |
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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 | - |
| unimpeded | (adjective) not slowed or prevented | - |
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| unimportant | (adjective) not important | - |
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| (adjective) devoid of importance, meaning, or force | Synonyms: insignificant |
| unimposing | (adjective) lacking in impressiveness | - |
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| unimpregnated | (adjective) not having been fertilized | Synonyms: unfertilised, unfertilized |
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| unimpressed | (adjective) not moved to serious regard | - |
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| unimpressionable | (adjective) not sensitive or susceptible to impression | - |
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| unimpressive | (adjective) not capable of impressing | - |
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| unimprisoned | (adjective) free from confinement or physical restraint | Synonyms: unconfined |
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| unimproved | (adjective) not made more desirable or valuable or profitable; especially not made ready for use or marketing | - |
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| (adjective) (of land) not cleared of trees and brush; in the wild or natural state | - |
| unincorporated | (adjective) not organized and maintained as a legal corporation | - |
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| unindustrialised | (adjective) not converted to industrialism | Synonyms: unindustrialized |
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| unindustrialized | (adjective) not converted to industrialism | Synonyms: unindustrialised |
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| uninebriated | (adjective) not inebriated | Synonyms: unintoxicated |
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| uninfected | (adjective) free from sepsis or infection | Synonyms: clean |
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| uninflected | (adjective) (of the voice) not inflected | - |
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| (adjective) not inflected | - |
| (adjective) expressing a grammatical category by using two or more words rather than inflection | Synonyms: analytic |
| uninfluenced | (adjective) not influenced or affected | Synonyms: unswayed, untouched |
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| uninfluential | (adjective) not influential | - |
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| uninformative | (adjective) lacking information | - |
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| uninformed | (adjective) not informed; lacking in knowledge or information | - |
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| uninhabitable | (adjective) not fit for habitation | - |
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| uninhabited | (adjective) not having inhabitants; not lived in | - |
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| uninhibited | (adjective) not inhibited or restrained | - |
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| uninitiate | (adjective) not initiated; deficient in relevant experience | Synonyms: naive, uninitiated |
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| uninitiated | (adjective) not initiated; deficient in relevant experience | Synonyms: naive, uninitiate |
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| uninjectable | (adjective) (used of drugs) not capable of being injected | - |
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| uninjured | (adjective) not injured physically or mentally | - |
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| uninominal | (adjective) based on the system of having only one member from each district (as of a legislature) | Synonyms: one-member |
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| uninquiring | (adjective) not inquiring | Synonyms: uninquisitive |
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| (adjective) deficient in curiosity | Synonyms: uninquisitive |
| uninquisitive | (adjective) not inquiring | Synonyms: uninquiring |
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| (adjective) deficient in curiosity | Synonyms: uninquiring |
| uninspired | (adjective) deficient in originality or creativity; lacking powers of invention | Synonyms: sterile, unimaginative, uninventive |
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| (adjective) having no intellectual or emotional or spiritual excitement | - |
| uninspiring | (adjective) depressing to the spirit | - |
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| uninstructed | (adjective) lacking information or instruction | Synonyms: naive, unenlightened |
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| uninstructive | (adjective) failing to instruct | - |
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| uninsurable | (adjective) not capable of being insured or not eligible to be insured | - |
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| uninsured | (adjective) not covered by insurance | - |
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| unintegrated | (adjective) separated or isolated from others or a main group | Synonyms: segregated |
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| (adjective) not integrated; not taken into or made a part of a whole | Synonyms: nonintegrated |
| unintelligent | (adjective) lacking intelligence | Synonyms: stupid |
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| unintelligible | (adjective) poorly articulated or enunciated, or drowned by noise | - |
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| (adjective) hard or impossible to understand | Synonyms: opaque |
| unintended | (adjective) not deliberate | - |
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| unintentional | (adjective) done or made or performed with purpose and intent | Synonyms: designed, intentional |
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| (adjective) not done with purpose or intent | Synonyms: unplanned, unwitting |
| uninterested | (adjective) not having or showing interest | - |
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| (adjective) having no care or interest in knowing | - |
| uninteresting | (adjective) arousing no interest or attention or curiosity or excitement | - |
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| (adjective) characteristic or suggestive of an institution especially in being uniform or dull or unimaginative | Synonyms: institutional |
| uninterrupted | (adjective) continuing in time or space without interruption | Synonyms: continuous |
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| (adjective) having undisturbed continuity | - |
| unintimidated | (adjective) not shrinking from danger | Synonyms: unblinking, unflinching, unshrinking |
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| unintoxicated | (adjective) not inebriated | Synonyms: uninebriated |
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| unintrusive | (adjective) not interfering or meddling | Synonyms: not intrusive |
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| uninucleate | (adjective) having one nucleus | - |
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| uninventive | (adjective) deficient in originality or creativity; lacking powers of invention | Synonyms: sterile, unimaginative, uninspired |
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| uninvited | (adjective) (of a person) not having been invited | - |
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| (adjective) (of a thought or act) unwelcome or involuntary | - |
| uninviting | (adjective) neither attractive nor tempting | - |
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| (adjective) not tempting | Synonyms: untempting |
| uninvolved | (adjective) not involved | - |
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| (adjective) showing lack of emotional involvement | Synonyms: degage, detached |
| union | (adjective) of trade unions | - |
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| unionised | (adjective) not converted into ions | Synonyms: nonionic, nonionised, nonionized, unionized |
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| (adjective) being a member of or formed into a labor union | Synonyms: organised, organized, unionized |