The Collaborative International Dictionary of English v.0.48:
Wilful \Wil"ful\, a., Wilfully \Wil"ful*ly\, adv., Wilfulness \Wil"ful*ness\, n. See Willful, Willfully, and Willfulness. [1913 Webster]WordNet (r) 3.0 (2006):
wilful adj 1: done by design; "the insult was intentional"; "willful disobedience" [syn: willful, wilful] 2: habitually disposed to disobedience and opposition [syn: froward, headstrong, self-willed, willful, wilful]