Evil, fiendish, devilish or diabolical.
Meaning relationships
Synonyms: demonic, diabolic, malefic, wicked, cacodaemoniacal, daemonical, demoniac, demoniacal, demonical, demonish, demonlike, demonly, devilish, diabolical, fallen angelic, fiendlike, satanic, satanical, abandoned, arrant, bad, bad apple, bad seed, baleful, scurrilous, baneful, base, black-hearted, dark, deleterious, depraved, despicable, detrimental, evil, evil-minded, facinorous, flagitious, harmful, heinous, ill-intentioned, ill-natured, immoral, incorrigible, iniquitous, iniquous, injurious, knavish, maleficent, malevolent, malicious, malign, malignant, naughty, nefarious, niddering, nidering, niding, nithing, no-good, peccaminous, pernicious, reprehensible, reprobate, scathful, sinful, sinister, sordid, sullen, ungodly, unholy, vicious, vile, villainous, wrong
Antonyms: none provided