Definition of "diabolically" [diabolically]

• In a diabolical manner. (adverb)

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• "Robbie Savage talks about his friendship with Roberto Mancini and how he feels Mark Hughes has been treated "diabolically" by Manchester City."
• "The contrast between his smiling face and the 'diabolically' bad news he was bringing to his fellow countrymen was a curious one."
• "It appears that they specialized in editing together still photos to look like rapid-fire animation, synced to the kind of diabolically cheery music you don’t hear on TV anymore."