ruthless synonyms

terrible cruel savage grim brutal outrageous oppressive relentless callous inhuman inexorable venomous atrocious flagrant unrelenting abominable barbarous tyrannical galling bloodthirsty fiendish

hard cold vicious ferocious unsympathetic implacable malevolent sadistic vindictive heartless merciless feral vengeful unforgiving remorseless obdurate pitiless rancorous tigerish unmerciful hardhearted cold-blooded revengeful unpitying unforbearing ferine