Old English wilfullīċe, corresponding to wilful + -ly.
wilfully (comparative more wilfully, superlative most wilfully)
- (obsolete) Willingly, of one's own free will.
- 1590, Edmund Spenser, The Faerie Queene, II.vi:
- Why then dost thou, O man, that of them all / Art Lord, and eke of nature Soueraine, / Wilfully make thy selfe a wretched thrall [...]?
- Deliberately, on purpose; maliciously.