N0049600 (nə-fâr′ē-əs)adj. Infamous by way of being extremely wicked.[Latin nefārius, from nefās, crime, transgression : ne-, not; see ne in Indo-European roots + fās, divine law; see dhē- in Indo-European roots.]ne·far′i·ous·ly adv.ne·far′i·ous·ness n.Thesaurus
Adv.
1.
nefariously - in a nefarious manner or to a nefarious degree; "nefariously involved in a conspiracy"