Source : Webster's Revised Unabridged Dictionary (1913)

Wilful \Wil"ful\, a., Wilfully \Wil"ful*ly\, adv., Wilfulness
\Wil"ful*ness\, n.
   See {Willful}, {Willfully}, and {Willfulness}.

Source : WordNet®

wilfully
     adv : in a willful manner; "she had willfully deceived me" [syn: {willfully}]