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

 

devilishly

 adverb
adverb
BrE BrE//ˈdevəlɪʃli//
 
; NAmE NAmE//ˈdevəlɪʃli//
 
(old-fashioned)
 
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extremely; very a devilishly hot day
See the Oxford Advanced American Dictionary entry: devilishly