murderous

adjective4

1. •
   Of, characterized by, or pertaining to murder or murderers.

   • While Harley had been in no way responsible for Pelton's murderous attack upon Yesler, public opinion held him to account. — 1909
2. •
   Of a person: intending or likely to commit murder; bloodthirsty, homicidal.

   • She gave me a murderous look.
3. •
   Very difficult.

   • conditions were murderous
4. •
   Of an object: used to commit murder; capable of causing death; deadly, fatal.

   • In necessary self-defence men have a right to kill their assailants. But duelling is unlawful and murderous, a remain of the ancient Gothic barbarity. — 1796