| uncomfortably | (adverb) in physical discomfort | - |
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| uncomparably | (adverb) in an incomparable manner or to an incomparable degree | Synonyms: incomparably |
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| uncontrollably | (adverb) in an uncontrolled manner | - |
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| undecipherably | (adverb) in an illegible manner | Synonyms: illegibly, unreadably |
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| undeniably | (adverb) to an undeniable degree or in an undeniable manner | - |
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| undependably | (adverb) in an unfaithful undependable unreliable manner | Synonyms: unfaithfully, unreliably |
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| understandably | (adverb) in an intelligible manner | Synonyms: clearly, intelligibly |
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| undesirably | (adverb) in an undesirable manner | Synonyms: unwantedly |
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| unfashionably | (adverb) in an unfashionable manner | - |
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| unfavorably | (adverb) showing disapproval; in a disparaging way | Synonyms: unfavourably |
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| unfavourably | (adverb) showing disapproval; in a disparaging way | Synonyms: unfavorably |
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| unforgettably | (adverb) in a memorable manner | Synonyms: memorably |
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| unforgivably | (adverb) in an unpardonable manner or to an unpardonable degree | Synonyms: inexcusably, unpardonably |
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| unimaginably | (adverb) to an unimaginable extent | Synonyms: unthinkably |
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| unimpeachably | (adverb) without question | Synonyms: unquestionably |
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| unintelligibly | (adverb) in an unintelligible manner | Synonyms: ununderstandably |
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| unjustifiably | (adverb) without any excuse | Synonyms: inexcusably |
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| unmanageably | (adverb) so as to be unmanageable | - |
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| unmemorably | (adverb) in an unmemorable manner | - |
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| unmistakably | (adverb) without possibility of mistake | - |
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| (adverb) in a signal manner | Synonyms: remarkably, signally |
| unnoticeably | (adverb) in an imperceptible manner or to an imperceptible degree | Synonyms: imperceptibly |
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| unpalatably | (adverb) in an unpalatable way | - |
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| unpardonably | (adverb) in an unpardonable manner or to an unpardonable degree | Synonyms: inexcusably, unforgivably |
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| unpredictably | (adverb) in an erratic unpredictable manner | Synonyms: erratically |
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| unprofitably | (adverb) in an unproductive manner | Synonyms: fruitlessly, unproductively |
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| (adverb) without gain or profit | Synonyms: gainlessly, profitlessly |
| unquestionably | (adverb) without question | Synonyms: unimpeachably |
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| (adverb) without question and beyond doubt | Synonyms: by all odds, decidedly, definitely, emphatically, in spades |
| unreadably | (adverb) in an illegible manner | Synonyms: illegibly, undecipherably |
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| unreasonably | (adverb) to a degree that exceeds the bounds of reason or moderation | Synonyms: immoderately |
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| (adverb) not in a reasonable or intelligent manner | - |
| unrecognizably | (adverb) beyond recognition; in an unrecognizable manner | Synonyms: unrecognisable |
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| unreliably | (adverb) in an unfaithful undependable unreliable manner | Synonyms: undependably, unfaithfully |
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| unremarkably | (adverb) under normal conditions | Synonyms: commonly, normally, ordinarily, usually |
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| unreproducibly | (adverb) in an unreproducible manner | Synonyms: inimitably |
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| unsatiably | (adverb) in an insatiable manner; with persistence but without satisfaction | Synonyms: insatiably |
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| (adverb) to an insatiable degree | Synonyms: insatiably |
| unseasonably | (adverb) not in accordance with the season | - |
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| unshakably | (adverb) with determination; in a determined manner | Synonyms: determinedly, unfalteringly |
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| unsociably | (adverb) in an unsociable manner | - |
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| unspeakably | (adverb) to an inexpressible degree | Synonyms: indescribably, ineffably, inexpressibly, unutterably |
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| unsufferably | (adverb) to an insufferable degree | Synonyms: insufferably |
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| unsuitably | (adverb) in an inappropriate manner | Synonyms: inappropriately |
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| unthinkably | (adverb) to an unimaginable extent | Synonyms: unimaginably |
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| ununderstandably | (adverb) in an unintelligible manner | Synonyms: unintelligibly |
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| unutterably | (adverb) to an inexpressible degree | Synonyms: indescribably, ineffably, inexpressibly, unspeakably |
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| unwarrantably | (adverb) in an unwarrantable manner or to an unwarranted degree | - |
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| variably | (adverb) with variation; in a variable manner or to a variable degree | - |
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| visibly | (adverb) in a visible manner | - |
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| (adverb) so as to be visible | - |
| volubly | (adverb) in a chatty manner | Synonyms: chattily |
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| vulnerably | (adverb) in a vulnerable manner | - |
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