Rogue - used to describe something or someone that is different from others in usually a dangerous or harmful way.
1 :resembling or suggesting a rogue elephant especially in being isolated, aberrant, dangerous, or uncontrollable <capsized by a rogue wave>
2 :corrupt, dishonest <rogue cops>
3 :of or being a nation whose leaders defy international law or norms of international behavior <rogue states>