Brutal
Part of speech: adjective
Definition: Savagely violent, vicious, ruthless, or cruel Crude or unfeeling in manner or speech. Harsh; unrelenting Disagreeably precise or penetrating In extreme metal, to describe the speed of the music and the density of riffs.
Example sentence: The pacifist is as surely a traitor to his country and to humanity as is the most brutal wrongdoer.
Inhumane
Part of speech: adjective
Definition: cruel and savage, not humane