Englishnefarious
adjective
the nefarious activities of the bodysnatchers:
wicked, evil, sinful, iniquitous, villainous, criminal, heinous, atrocious, appalling, abhorrent, vile, foul, base, abominable, odious, depraved, corrupt, shameful, scandalous, monstrous, fiendish, diabolical, devilish, unholy, ungodly, infernal, satanic, dark, unspeakable, despicable, outrageous, shocking, disgraceful;
archaic knavish, dastardly;
rare egregious, flagitious.
▷antonyms good, admirable.