| unattached | (adjective) not associated in an exclusive sexual relationship | Synonyms: uncommitted |
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| (adjective) not fastened together | - |
| (adjective) (of animals) able to swim about; not attached | Synonyms: free-swimming |
| unattackable | (adjective) immune to attack; incapable of being tampered with | Synonyms: impregnable, inviolable, secure, strong, unassailable |
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| unattainable | (adjective) impossible to achieve | Synonyms: unachievable, undoable, unrealizable |
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| unattended | (adjective) lacking accompaniment or a guard or escort | - |
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| (adjective) lacking a caretaker | Synonyms: neglected |
| (adjective) not watched | - |
| unattired | (adjective) having removed clothing | Synonyms: unappareled, unclad, undressed, ungarbed, ungarmented |
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| unattractive | (adjective) lacking beauty or charm | - |
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| (adjective) lacking power to arouse interest | - |
| (adjective) not appealing to the senses | Synonyms: untempting |
| unattributable | (adjective) not attributable | Synonyms: unascribable |
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| unauthentic | (adjective) false or fake; not what it appears to be | Synonyms: inauthentic, spurious |
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| unauthorised | (adjective) not endowed with authority | Synonyms: unauthorized |
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| (adjective) without official authorization | Synonyms: unauthorized, wildcat |
| unauthorized | (adjective) not endowed with authority | Synonyms: unauthorised |
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| (adjective) without official authorization | Synonyms: unauthorised, wildcat |
| unavailable | (adjective) not available or accessible or at hand | - |
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| unavailing | (adjective) producing no result or effect | Synonyms: futile, ineffectual, meaningless, otiose |
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| unavenged | (adjective) for which vengeance has not been taken | - |
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| unavoidable | (adjective) impossible to avoid or evade | Synonyms: ineluctable, inescapable |
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| unavowed | (adjective) not openly expressed | Synonyms: sneaking |
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| (adjective) not openly made known | Synonyms: secret |
| (adjective) not affirmed or mentioned or declared | - |
| unawakened | (adjective) not aroused or activated | - |
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| (adjective) still asleep | - |
| unaware | (adjective) (often followed by `of') not aware | Synonyms: incognizant |
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| unawed | (adjective) not awed | - |
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| unbacked | (adjective) unsupported by other people | Synonyms: single-handed, unassisted |
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| unbaffled | (adjective) not perplexed by conflicting situations or statements | Synonyms: unconfused |
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| unbalanced | (adjective) being or thrown out of equilibrium | Synonyms: imbalanced |
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| (adjective) affected with madness or insanity | Synonyms: brainsick, crazy, demented, disturbed, mad, sick, unhinged |
| (adjective) debits and credits are not equal | - |
| unbalconied | (adjective) not having balconies | - |
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| unbanded | (adjective) not identified with a band | - |
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| unbaptised | (adjective) not having undergone the Christian ritual of baptism | Synonyms: unbaptized |
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| unbaptized | (adjective) not having undergone the Christian ritual of baptism | Synonyms: unbaptised |
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| unbarred | (adjective) not firmly fastened or secured | Synonyms: unbolted, unlatched, unlocked, unsecured |
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| unbarreled | (adjective) not in a barrel | Synonyms: unbarrelled |
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| unbarrelled | (adjective) not in a barrel | Synonyms: unbarreled |
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| unbearable | (adjective) incapable of being tolerated or endured | Synonyms: intolerable, unendurable |
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| unbeatable | (adjective) incapable of being overcome or subdued | Synonyms: invincible, unvanquishable |
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| (adjective) hard to defeat | - |
| unbeaten | (adjective) not conquered | Synonyms: unconquered, unvanquished |
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| unbecoming | (adjective) not in keeping with accepted standards of what is right or proper in polite society | Synonyms: indecent, indecorous, uncomely, unseemly, untoward |
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| unbefitting | (adjective) not befitting | - |
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| unbeholden | (adjective) free of moral obligation | - |
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| unbeknown | (adjective) (usually used with `to') occurring or existing without the knowledge of | Synonyms: unbeknownst |
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| unbeknownst | (adjective) (usually used with `to') occurring or existing without the knowledge of | Synonyms: unbeknown |
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| unbelievable | (adjective) beyond belief or understanding | Synonyms: incredible |
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| (adjective) having a probability too low to inspire belief | Synonyms: improbable, unconvincing, unlikely |
| unbelieving | (adjective) holding that only material phenomena can be known and knowledge of spiritual matters or ultimate causes is impossible | Synonyms: nescient |
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| (adjective) denying or questioning the tenets of especially a religion | Synonyms: disbelieving, sceptical, skeptical |
| (adjective) rejecting any belief in gods | Synonyms: atheistic, atheistical |
| unbeloved | (adjective) unhappy in love; suffering from unrequited love | Synonyms: bereft, lovelorn |
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| unbelted | (adjective) lacking a belt | Synonyms: beltless |
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| unbendable | (adjective) marked by firm determination or resolution; not shakable | Synonyms: firm, steadfast, steady, stiff, unfaltering, unshakable, unwavering |
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| unbending | (adjective) incapable of adapting or changing to meet circumstances | Synonyms: inflexible, rigid |
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| unbeneficed | (adjective) not having a benefice | - |
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| unbent | (adjective) erect in posture | Synonyms: straight, unbowed |
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| (adjective) not bent | - |
| unbiased | (adjective) characterized by a lack of partiality | Synonyms: indifferent, unbiassed |
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| (adjective) without bias | Synonyms: unbiassed |
| unbiassed | (adjective) characterized by a lack of partiality | Synonyms: indifferent, unbiased |
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| (adjective) without bias | Synonyms: unbiased |
| unbigoted | (adjective) not opinionated | - |
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| unbitter | (adjective) having or showing no resentment or desire for revenge | - |
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| unbleached | (adjective) not artificially colored or bleached | Synonyms: uncolored, undyed |
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| unblemished | (adjective) free from physical or moral spots or stains | Synonyms: unmarred, unmutilated |
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| unblended | (adjective) not blended or mixed together | - |
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| unblessed | (adjective) not provided with something desirable | - |
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| unblinking | (adjective) not shrinking from danger | Synonyms: unflinching, unintimidated, unshrinking |
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| (adjective) showing no visible emotion | - |
| unbloody | (adjective) achieved without bloodshed | Synonyms: nonviolent |
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| unblushing | (adjective) feeling no shame | Synonyms: shameless |
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| unbodied | (adjective) having no body | - |
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| (adjective) not having a material body | Synonyms: bodiless, discorporate, disembodied, unembodied |
| unbolted | (adjective) not firmly fastened or secured | Synonyms: unbarred, unlatched, unlocked, unsecured |
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| unbooked | (adjective) not reserved in advance | - |
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| unbordered | (adjective) having no border | - |
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| unborn | (adjective) not yet brought into existence | - |
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| unbound | (adjective) not restrained or tied down by bonds | - |
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| (adjective) not secured within a cover | - |
| (adjective) not held in chemical or physical combination | - |
| unbounded | (adjective) seemingly boundless in amount, number, degree, or especially extent | Synonyms: boundless, limitless |
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| unbowed | (adjective) erect in posture | Synonyms: straight, unbent |
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| (adjective) not forced to bow down to a conqueror | - |
| unbraced | (adjective) without braces or props | - |
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| unbrainwashed | (adjective) not successfully subjected to brainwashing | - |
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| unbranched | (adjective) without branches | Synonyms: unbranching |
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| unbranching | (adjective) without branches | Synonyms: unbranched |
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| unbranded | (adjective) not marked with a brand | - |
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| unbreakable | (adjective) impossible to break especially under ordinary usage | - |
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| unbridgeable | (adjective) not bridgeable | - |
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| unbridled | (adjective) not restrained or controlled | Synonyms: unchecked, uncurbed, ungoverned |
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| unbroken | (adjective) not broken; whole and intact; in one piece | - |
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| (adjective) marked by continuous or uninterrupted extension in space or time or sequence | - |
| (adjective) (especially of promises or contracts) not violated or disregarded | Synonyms: kept |
| (adjective) (of farmland) not plowed | Synonyms: unploughed, unplowed |
| (adjective) not subdued or trained for service or use | - |
| unbrushed | (adjective) (of hair or clothing) not brushed | - |
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| unburdened | (adjective) not burdened with difficulties or responsibilities | - |
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| (adjective) not encumbered with a physical burden or load | Synonyms: burdenless |
| unburied | (adjective) not buried | - |
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| unburnished | (adjective) of metals e.g.; not made shiny and smooth by friction | - |
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| unbuttoned | (adjective) not buttoned | Synonyms: unfastened |
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| (adjective) not under constraint in action or expression | Synonyms: unlaced |
| uncamphorated | (adjective) not containing camphor | - |
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| uncanny | (adjective) surpassing the ordinary or normal | Synonyms: preternatural |
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| (adjective) suggesting the operation of supernatural influences | Synonyms: eldritch, unearthly, weird |
| uncapped | (adjective) used especially of front teeth | - |
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| uncarbonated | (adjective) not having carbonation | Synonyms: noncarbonated |
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| uncaring | (adjective) without care or thought for others | Synonyms: thoughtless, unthinking |
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| (adjective) lacking affection or warm feeling | Synonyms: detached, unaffectionate |
| uncarpeted | (adjective) not carpeted | - |
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| uncarved | (adjective) not carved | - |
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| uncastrated | (adjective) not castrated | - |
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| uncategorised | (adjective) not categorized or sorted | Synonyms: uncategorized, unsorted |
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| uncategorized | (adjective) not categorized or sorted | Synonyms: uncategorised, unsorted |
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| uncaulked | (adjective) not caulked or sealed | - |
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| uncaused | (adjective) having no cause or apparent cause | Synonyms: causeless, fortuitous |
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| unceasing | (adjective) uninterrupted in time and indefinitely long continuing | Synonyms: ceaseless, constant, incessant, never-ending, perpetual, unremitting |
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| (adjective) continuing forever or indefinitely | Synonyms: aeonian, ageless, eonian, eternal, everlasting, perpetual, unending |
| uncensored | (adjective) not subject to censorship | - |
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| unceremonial | (adjective) without ceremony or formality | Synonyms: unceremonious |
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| unceremonious | (adjective) without due formalities | - |
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| (adjective) without ceremony or formality | Synonyms: unceremonial |
| uncertain | (adjective) not established beyond doubt; still undecided or unknown | - |
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| (adjective) lacking or indicating lack of confidence or assurance | Synonyms: incertain, unsure |
| (adjective) not certain to occur; not inevitable | - |
| (adjective) not established or confirmed | Synonyms: unsealed |
| (adjective) ambiguous (especially in the negative) | - |
| (adjective) not consistent or dependable | - |
| (adjective) subject to change | Synonyms: changeable, unsettled |
| uncertified | (adjective) lacking requisite official documentation or endorsement | - |
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| unchained | (adjective) not bound by shackles and chains | Synonyms: unfettered, unshackled, untied |
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| unchallengeable | (adjective) not open to challenge | - |
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| unchallenged | (adjective) generally agreed upon; not subject to dispute | Synonyms: undisputed, unquestioned |
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| unchangeable | (adjective) not changeable or subject to change | - |
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| unchanged | (adjective) not made or become different | - |
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| (adjective) remaining in an original state | Synonyms: unaltered |