Brutal -
atrocious, barbarous, bloodthirsty, callous, cruel, feral, ferocious, hard, harsh, heartless, inhuman, merciless, murderous, pitiless, remorseless, rough, rude, ruthless, savage, severe, terrible, unmerciful, vicious, bestial, brute, brutish, cold-blooded, fierce, gory, nasty, rancorous, sadistic, uncompromising, unfeeling, unforgiving, unpitying, violent, wild