Synonyms of unkindly

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