wilful
2 occurrences across the corpus
KJV Apocrypha (Catholic Deuterocanon)
Sirach (Ecclesiasticus) 20:3
How good is it, when thou art reproved, to shew repentance! for so shalt thou escape wilful sin.
Sirach (Ecclesiasticus) 30:8
An horse not broken becometh headstrong: and a child left to himself will be wilful.