Transgressor
/trænzˈɡresər/
Definition 1 of 1
Pro Tip 1/3Negative Connotation
Transgressor always implies someone did something wrong or unacceptable. 
After sneaking out, she felt like a transgressor returning home.
Pro Tip 2/3Severity of Action
The word often indicates serious rule-breaking, more than just a small mistake. 
The whistleblower exposed the executive as a corporate transgressor.
Pro Tip 3/3Moral or Social
Used for breaking not just legal rules but also moral or social norms. 
She was seen as a transgressor by the community for her unconventional lifestyle.