| unlawfully | (adverb) not conforming to the law | - |
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| unmanfully | (adverb) without qualities thought to befit a man | Synonyms: unmanly |
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| unmercifully | (adverb) without pity; in a merciless manner | Synonyms: mercilessly, pitilessly, remorselessly |
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| unmindfully | (adverb) in a careless and thoughtless manner | - |
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| unsuccessfully | (adverb) without success | - |
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| untruthfully | (adverb) in a mendacious and untruthful manner | Synonyms: mendaciously |
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| usefully | (adverb) in a useful manner | - |
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| vengefully | (adverb) in a vindictive, revengeful manner | Synonyms: revengefully, vindictively |
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| wastefully | (adverb) to a wasteful manner or to a wasteful degree | Synonyms: prodigally |
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| watchfully | (adverb) in a watchful manner | Synonyms: vigilantly |
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| wilfully | (adverb) in a willful manner | Synonyms: willfully |
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| willfully | (adverb) in a willful manner | Synonyms: wilfully |
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| wishfully | (adverb) in a wishful manner | - |
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| wistfully | (adverb) in a wistful manner | - |
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| woefully | (adverb) in an unfortunate or deplorable manner | Synonyms: deplorably, lamentably, sadly |
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| wonderfully | (adverb) (used as an intensifier) excellently | Synonyms: marvellously, marvelously, superbly, terrifically, toppingly, wondrous, wondrously |
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| wrathfully | (adverb) in a wrathful manner | - |
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| wrongfully | (adverb) in an unjust or unfair manner | - |
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| youthfully | (adverb) in a youthful manner | - |
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| zestfully | (adverb) with zest | Synonyms: zestily |
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