NEFARIOUS Meaning of NEFARIOUS in English [ nɪ'fɛ:rɪəs ]■ adjective wicked or criminal.Derivatives~ly adverb~ness noun OriginC17: from L. nefarius , from nefas , nefar- 'wrong' + -ous . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004