devilishly
adverb/ˈdevəlɪʃli/
/ˈdevəlɪʃli/
(old-fashioned)- extremely; very
- a devilishly hot day
Oxford Collocations DictionaryDevilishly is used with these verbs:- grin
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devilishly
Definition of devilishly adverb from the Oxford Advanced Learner's Dictionary