vicious

adjective3

1. •
   violent and cruel, likely to hurt someone badly or to destroy things
2. •
   Savage and aggressive.
3. •
   (no longer used) Pertaining to vice; characterised by immorality or depravity.

   • We may so seize on vertue, that if we embrace it with an over-greedy and violent desire, it may become vicious. — 2006