The definition of nefarious is someone who is known for being very wicked.adjective
An example of nefarious is Adolf Hitler.YourDictionary definition and usage example. Copyright © 2013 by LoveToKnow Corp.
Origin: L nefarius < nefas, crime, sin < ne-, not + fas, (divine) law, lawful
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Origin: Latin nefārius, from nefās, crime, transgression : ne-, not; see ne in Indo-European roots + fās, divine law; see dhē- in Indo-European roots.
- ne·farˈi·ous·ly adverb
- ne·farˈi·ous·ness noun