Meaning of “nefarious” in the English Dictionary

"nefarious" in British English

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nefariousadjective

uk /nəˈfeə.ri.əs/ us /nəˈfer.i.əs/ formal
nefariously
adverb uk /nəˈfeə.ri.əs.li/ us /nəˈfer.i.əs.li/
nefariousness
noun [ U ] uk /nəˈfeə.ri.əs.nəs/ us /nəˈfer.i.əs.nəs/

(Definition of “nefarious” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)