adjective

Horrifyingly wicked.

atrocious cruelties

brutal,barbaric,barbarous,brutish,savage,vicious,wicked,cruel,nasty,ruthless,merciless,villainous,murderous,heinous,nefarious,monstrous,base,low,low-down,vile,inhuman,infernal,dark,black,black-hearted,fiendish,hellish,diabolical,ghastly,horrible