Definition of “wilful” - English Dictionary

“wilful” in British English

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wilfuladjective

disapproving US usually willful uk /ˈwɪl.fəl/ us /ˈwɪl.fəl/
wilfully
adverb US usually willfully uk /ˈwɪl.fəl.i/ us /ˈwɪl.fəl.i/

Some basic safety rules were wilfully ignored.
wilfulness
noun [ U ] US usually willfulness uk /ˈwɪl.fəl.nəs/ us /ˈwɪl.fəl.nəs/

(Definition of “wilful” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)