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):
wilfulness n 1: the trait of being prone to disobedience and lack of discipline [syn: unruliness, fractiousness, willfulness, wilfulness]