modified
Morally evil
evil, immoral, unethical, corrupt, unprincipled, sinful, bad, base, foul, gross, dissolute, wayward, irreligious, blasphemous, profane, evil-minded, vile, degenerate, depraved, incorrigible, heartless, shameless, degraded, debauched, hard, toughened, disreputable, infamous, indecent, mean, remorseless, reprobate, salacious, iniquitous, scandalous, atrocious, contemptible, nasty, rotten*, low-down*, good-for-nothing*, dirty*.
Antonyms good*, virtuous, pure*.
Capable of doing great damage
vicious, fiendish, diabolical, hellish, villainous, rascally, devilish, malevolent, malicious, plotting, conspiratorial, iniquitous, flagrant, nefarious, criminal, heinous, murderous, tricky, sinister, ignoble, monstrous, opprobrious, felonious, dangerous, cutthroat, ratty*, slippery*, crooked*.
Antonyms honest*, just, kind.
Naughty
naughty, mischievous, roguish; see naughty.
wicked and evil both connote willful violation of a moral code, but evil often has ominous or malevolent implications an evil hour, and wicked is sometimes weakened in a playful way to mean merely mischievous wicked with; ill, which is slightly weaker than evil in its implications of immorality, is now used chiefly in certain idiomatic phrases ill-gotten gains; naughty today implies mere mischievousness or disobedience a naughty child; bad, in this comparison, is the broadest term, ranging in implication from merely unsatisfactory to utterly depraved