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

 

mischievously

 adverb
adverb
BrE BrE//ˈmɪstʃɪvəsli//
 
; NAmE NAmE//ˈmɪstʃɪvəsli//
 
 
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in a slightly humorous way that plays tricks or annoys people slightly He grinned mischievously and quickly jumped into the water.