noun

a savagely violent person or animal.

he was a cold-blooded brute

savage,beast,monster,animal,sadist,barbarian,devil,demon,fiend,ogre,thug,lout,boor,oaf,ruffian,yahoo,rowdy,bully boy,swine,bastard,pig,radge

adjective

characterized by an absence of reasoning or intelligence.

a brute struggle for social superiority