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What Is the Difference Between vicious, villainous, and nefarious?
Nefarious comes from the Latin adjective nefarius and the Latin noun nefas, which means "crime." Nefas is a combination of ne- ("not") and fas, meaning "right" or "divine law."
Examples of nefarious in a Sentence
Moreover, those starry-eyed states inclined to perceive international relations in moral terms frequently underestimate the nefarious machinations of their competitors on the world political stage.
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Richard Wolin, New Republic, 4 June 2001
… I always give the same response: Just because Frank posed for pictures with every leading capo, underboss and cement contractor of the day doesn't mean that he joined them in their nefarious underworld activities. Oh, occasionally he rode along on a hit or two, but that was just one of those social obligations …
—Lewis Grossberger, Time, 21 Dec. 1998
Three-tenths of a mile uphill from our mailbox on the road, that bend is so nefarious that neophytes often skidded into a snowbank or wound up fender-deep in mud there.
—Maxine Kumin, In Deep, 1987
a nefarious scheme to cheat people out of their money
the chaste heroines and nefarious villains of old-time melodramas
Richard Wolin, New Republic, 4 June 2001
… I always give the same response: Just because Frank posed for pictures with every leading capo, underboss and cement contractor of the day doesn't mean that he joined them in their nefarious underworld activities. Oh, occasionally he rode along on a hit or two, but that was just one of those social obligations …
—Lewis Grossberger, Time, 21 Dec. 1998
Three-tenths of a mile uphill from our mailbox on the road, that bend is so nefarious that neophytes often skidded into a snowbank or wound up fender-deep in mud there.
—Maxine Kumin, In Deep, 1987
a nefarious scheme to cheat people out of their money
the chaste heroines and nefarious villains of old-time melodramas
Recent Examples on the Web
Occasionally other nefarious actors would create their own webpages with similar domain names.
—Jacob Feldman, Sportico.com, 3 Sep. 2025
This would point any nefarious civilization in the direction of the aforementioned Dyson spheres, probably.
—Fran Ruiz, Space.com, 2 Sep. 2025
Their investigation leads them to Dayal (Soubin Shahir) and Simon (Nagarjuna), members of a crime syndicate using one of Rajasekar's inventions — a chair-like contraption with the ability to cremate bodies — for their own nefarious purposes.
—Randall Colburn, EW.com, 1 Sep. 2025
Some conspiracy theorists have suggested Epstein’s death was nefarious and meant to hide something.
—Alex Gangitano, The Hill, 22 Aug. 2025
See All Example Sentences for nefarious
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Jacob Feldman, Sportico.com, 3 Sep. 2025
This would point any nefarious civilization in the direction of the aforementioned Dyson spheres, probably.
—Fran Ruiz, Space.com, 2 Sep. 2025
Their investigation leads them to Dayal (Soubin Shahir) and Simon (Nagarjuna), members of a crime syndicate using one of Rajasekar's inventions — a chair-like contraption with the ability to cremate bodies — for their own nefarious purposes.
—Randall Colburn, EW.com, 1 Sep. 2025
Some conspiracy theorists have suggested Epstein’s death was nefarious and meant to hide something.
—Alex Gangitano, The Hill, 22 Aug. 2025
See All Example Sentences for nefarious
Cite this Entry
“Nefarious.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/nefarious. Accessed 8 Sep. 2025.
Copy CitationKids Definition
nefarious
adjective
ne·far·i·ous
ni-ˈfar-ē-əs 
-ˈfer-
: very wicked : evil
nefariously
adverb
nefariousness
noun
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