1. deliberately doing something despite knowing it is wrong or unreasonable; stubborn
Usage: British spelling; American spelling is ‘willful’
2. done consciously and intentionally
Usage: British spelling; American spelling is ‘willful’; often used in legal contexts

Examples

• The wilful child refused to eat his vegetables despite repeated warnings.
• Her wilful disobedience of the rules led to her suspension.
• The court found him guilty of wilful destruction of property.
• He showed wilful disregard for safety regulations.
• The teenager’s wilful behavior frustrated her parents.
• The company was accused of wilful negligence in the accident.