adjective extremely wicked or villainous; iniquitous: a nefarious plot.
Origin: 1595–1605; <
Latin nefārius wicked, vile, equivalent to
nefās offense against divine or moral law (
ne- negative prefix +
fās law, right) +
-ius -ious, with intervocalic
s >
r Related formsne·far·i·ous·ly, adverb
ne·far·i·ous·ness, noun
un·ne·far·i·ous, adjective
un·ne·far·i·ous·ly, adverb
un·ne·far·i·ous·ness, noun
Synonyms
flagitious, heinous, infamous; vile, atrocious, execrable.
Antonyms
good, honest.