Definition of nefarious adjective from the Oxford Advanced Learner's Dictionary

 

nefarious

 adjective
adjective
BrE BrE//ˈfeəriəs//
 
; NAmE NAmE//ˈferiəs//
 
(formal) Immoral
 
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criminal; immoral nefarious activities See related entries: Immoral Word Origin early 17th cent.: from Latin nefarius, from nefas, nefar- ‘wrong’ (from ne- ‘not’ + fas ‘divine law’) + -ous.
See the Oxford Advanced American Dictionary entry: nefarious