- extremely wicked or villainous; iniquitous: a nefarious plot.
Origin of nefarious
1595–1605; < Latin nefārius wicked, vile, equivalent to nefās offense against divine or moral law (ne- negative prefix + fās law, right) + -ius -ious, with intervocalic s > r
SynonymsSee more synonyms for nefarious on Thesaurus.com
flagitious, heinous, infamous; vile, atrocious, execrable.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for nefariousness
Mary gratified her eager mind by careful studies in this chosen line of nefariousness.Within the Law
There was a nefariousness about the new suggestion that proved very attractive in Blentmouth.Tristram of Blent
The nefariousness of the scheme thus revealed infuriated Barmouth.The Intrusions of Peggy
- evil; wicked; sinful
C17: from Latin nefārius, from nefās unlawful deed, from nē not + fās divine law
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for nefariousness
Online Etymology Dictionary, © 2010 Douglas Harper