Synonyms of brutishly

2 Syllables
meanly
3 Syllables
brutally, fiercely, unkindly, ruthlessly, viciously, callously, ferally, heartlessly
4 Syllables
hardheartedly, murderously, ferociously, relentlessly, savagely, mercilessly, atrociously, barbarously, inhumanly, pitilessly
5 Syllables
unrelentingly, inexorably, barbarically, demoniacally, diabolically, inhumanely, remorselessly