Definition of willful adjective from the Oxford Advanced American Dictionary

     

    willful

     adjective
    (also wilful)adjective
    NAmE//ˈwɪlfl//
     
    (disapproving)
     
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  1. 1 [usually before noun] (of a bad or harmful action) done deliberately, although the person doing it knows that it is wrong willful damage/misconduct/neglect
  2. 2determined to do what you want; not caring about what other people want synonym headstrong a willful child
NAmE//ˈwɪlfəli//
 
adverb They were charged with willfully neglecting their children.
willfulness
 
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noun [uncountable] the willfulness and arrogance of human nature
See the Oxford Advanced Learner's Dictionary entry: willful