A willful law breaker is described as what

A willful law breaker is often described as a "defiant" or "contumacious" individual.

• Defiant: showing a refusal to obey or comply with authority, often in a bold or insolent manner.
• Contumacious: stubbornly refusing to obey or comply with authority, often in a deliberate and intentional manner.

Other adjectives that may be used to describe a willful law breaker include:

• Rebellious: showing a tendency to resist or defy authority.
• Disobedient: refusing to obey or comply with rules or orders.
• Insolent: showing a lack of respect or obedience to authority.
• Recalcitrant: stubbornly refusing to comply with authority or rules.
• Uncooperative: refusing to cooperate or comply with authority or requests.

It's worth noting that these terms can have different connotations and nuances depending on the context in which they are used.