ferocious; brutal; atrocious; savage; barbarous
dangerous weapon; lethal weapon; deadly weapon; murder weapon
atrocious; fiendish; brutal; villainous
scoundrel; ruffian; villain
ringleader; main culprit; main cause; source
villain; outlaw; assassin
catastrophe; assassination; calamity; disaster
person with a criminal record; violent criminal
great harm (esp. to a person); murder
brute; violent criminal; savage