adj. 25B6; adjective
wilful destruction : DELIBERATE, intentional, done on purpose, premeditated, planned, conscious.
a wilful child : HEADSTRONG, strong-willed, obstinate, stubborn, pig-headed, recalcitrant, uncooperative, obstreperous, ungovernable, unmanageable; Brit. informal bloody-minded, bolshie; N. Amer. informal balky; formal refractory; archaic froward, contumacious.
accidental, amenable.