A scoundrel, rascal, or unprincipled, deceitful, brutal and unreliable person.
To play the ruffian; to rage; to raise tumult.
Brutal; cruel; savagely boisterous; murderous.
One who violates (a rule, a boundary, another person's body, etc.); offender
In the publishing and packaging industries, a visual element that intentionally "violates" the underlying design, such as a starburst, color bar or "splat" on a product package or magazine cover intended to attract special attention.