Learn how to say Nefariously correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word nefarious:
(typically of an action or activity) wicked or criminal:
the nefarious activities of the organized-crime syndicates
early 17th century: from Latin nefarius, from nefas, nefar- ‘wrong’ (from ne- ‘not’ + fas ‘divine law’) + -ous