1. the quality of being determined to do what one wants, often despite opposition or advice from others
2. deliberate and intentional behavior, especially when defying rules or authority

Examples

• The child’s willfulness made it difficult for teachers to manage the classroom.
• Her willfulness in pursuing the project despite budget cuts impressed her colleagues.
• The teenager’s willfulness often clashed with his parents’ expectations.
• The committee admired his willfulness in defending unpopular but necessary reforms.
• Their willfulness in ignoring safety protocols led to serious consequences.
• She showed remarkable willfulness in completing her degree while working full-time.