intentional or deliberate

जानबूझकर

English Usage: His willful disregard for the rules led to serious consequences.

Hindi Usage: उसके जानबूझकर नियमों की अवहेलना के कारण गंभीर परिणाम हुए।

the faculty by which a person decides on and initiates action

साधन या इच्छा

English Usage: Her strong willfulness made her a natural leader.

Hindi Usage: उसकी मजबूत साधनता ने उसे एक प्राकृतिक नेता बना दिया।