adverb
EXAMPLES FROM CORPUS
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Because he was so devilishly attractive that she couldn't resist him?
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But they matter enormously-and they will be devilishly hard to achieve.
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It's easy enough in the early stages, but gets devilishly hard as you get further on.
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No other contemporary band is this fiercely unique or devilishly immediate.
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Nor was he as devilishly brilliant as George Best.