horrifyingly wicked.
"atrocious cruelties"
synonyms: brutal, barbaric, barbarous, brutish, savage, vicious, wicked, cruel, nasty, ruthless, merciless, villainous, murderous, heinous, nefarious, monstrous, base, low, lowdown, vile, inhuman, infernal, dark, black, black-hearted, fiendish, hellish, diabolical, ghastly, horrible; abominable, outrageous, offensive, hateful, disgusting, despicable, contemptible, loathsome, odious, revolting, repellent, repugnant, abhorrent, harrowing, nightmarish, gruesome, grisly, sickening, nauseating, horrifying, hideous, unspeakable, unforgivable, intolerable, beyond the pale, scandalous, flagrant, execrable; informalhorrid, gross, sick-making, sick; informalbeastly; archaicdisgustful, loathly, scurvy; rareegregious, flagitious, cacodemonic, facinorous
"atrocious cruelties were committed in the name of religion"