THESAURUS
ferociously
atrociously, barbarously, bec et ongles, bestially, brutally, brutishly, cruelly, devilishly, diabolically, ferally, fiendishly, fiercely, inhumanely, inhumanly, mercilessly, pitilessly, ruthlessly, savagely, sharkishly, slaveringly, tooth and nail, truculently, unhumanly, viciously, wolfishly