Mary gratified her eager mind by careful studies in this chosen line of nefariousness.
There was a nefariousness about the new suggestion that proved very attractive in Blentmouth.
The nefariousness of the scheme thus revealed infuriated Barmouth.
c.1600, from Latin nefarius "wicked, abominable, impious," from nefas "crime, wrong, impiety," from ne- "not" (see un-) + fas "right, lawful, divinely spoken," related to fari "to speak" (see fame (n.)). Related: Nefariously.