callously

ferociously fiercely mercilessly relentlessly ruthlessly savagely viciously

atrociously barbarically barbarously brutishly demoniacally diabolically ferally hardheartedly heartlessly in cold blood inexorably inhumanely inhumanly meanly murderously pitilessly remorselessly something fierce something terrible unkindly unrelentingly

gently humanely kindly nicely

calculatedly coldheartedly coldly cruelly deliberately dispassionately heartlessly indifferently intentionally premeditatedly ruthlessly unemotionally unfeelingly with full intent