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

 

wilfully

 adverb
adverb
BrE BrE//ˈwɪlfəli//
 
; NAmE NAmE//ˈwɪlfəli//
 
(disapproving)
 
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deliberately, although you know that what you are doing is wrong They were charged with wilfully neglecting their children.