— nefariously , adv. — nefariousness , n.
/ni fair"ee euhs/ , adj.
extremely wicked or villainous; iniquitous: a nefarious plot.
[ 1595-1605; nefarius wicked, vile, equiv. to nefas offense against divine or moral law ( ne- negative prefix + fas law, right) + -ius -IOUS, with intervocalic s > r ]
Syn . flagitious, heinous, infamous; vile, atrocious, execrable.
Ant . good, honest.