adjective

savagely fierce, cruel, or violent.

a ferocious beast

fierce,savage,wild,feral,untamed,predatory,rapacious,ravening,aggressive,dangerous,brutal,brutish,vicious,violent,bloody,barbarous,barbaric,sadistic,ruthless,remorseless,cruel,pitiless,merciless,heartless,bloodthirsty,murderous,tigerish,wolfish,wicked,inhuman,monstrous,abominable,fiendish,hellish,diabolical,beastly,fell,sanguinary