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English definition of “nefarious”

nefarious

adjective     /nəˈfeə.ri.əs/ US  /-ˈfer.i-/ formal
( especially of activities ) morally bad : The director of the company seems to have been involved in some nefarious practices / activities .Morally wrong and evilDishonest nefariously     /-li/ adverb nefariousness     /-nəs/ noun [U]
(Definition of nefarious adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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