English

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

 

diabolically

 adverb
adverb
BrE BrE//ˌdaɪəˈbɒlɪkli//
 
; NAmE NAmE//ˌdaɪəˈbɑːlɪkli//
 
(informal, especially British English)
 
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in an extremely bad or annoying way synonym terribly