cruelly, without remorse
● Viciously
● Fiercely
● Savagely
● In cold blood
● Meanly
● Murderously
● Mercilessly
● Relentlessly
● Ferociously
● Ruthlessly
● Atrociously
● Barbarically
● Barbarously
● Brutishly
● Callously
● Demoniacally
● Diabolically
● Ferally
● Heartlessly
● Inexorably
● Inhumanely
● Inhumanly
● Pitilessly
● Remorselessly
● Something fierce
● Something terrible
● Unkindly
● Unrelentingly
● Nicely
● Humanely
● Gently
● Kindly
● Hardheartedly