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Definition of diabolically adverb from the Oxford Advanced Learner's Dictionary

diabolically

adverb
 
/ˌdaɪəˈbɒlɪkli/
 
/ˌdaɪəˈbɑːlɪkli/
(informal, especially British English)
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  1. in an extremely bad or annoying way synonym terribly
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preposition
 
 
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