| unfailingly | (adverb) without fail | - |
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| unfairly | (adverb) in an unfair manner | Synonyms: below the belt |
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| unfaithfully | (adverb) in an unfaithful undependable unreliable manner | Synonyms: undependably, unreliably |
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| unfalteringly | (adverb) with determination; in a determined manner | Synonyms: determinedly, unshakably |
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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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