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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
Millions of low-cost devices for media streaming, in-vehicle entertainment, and video projection are infected with malware that turns consumer networks into platforms for distributing malware, concealing nefarious communications, and performing other illicit activities, the FBI has warned.
—Dan Goodin, ArsTechnica, 6 June 2025
The show follows Royal Newfoundland Constabulary Inspector, Donny ‘Fitz’ Fitzpatrick, who digs too deeply into a local politician’s nefarious activity, and is exiled to work in Saint-Pierre et Miquelon.
—Jesse Whittock, Deadline, 4 June 2025
Around the world, nefarious state and nonstate actors are extracting enormous value from forests to fund their operations.
—Justyna Gudzowska, Foreign Affairs, 2 June 2025
If not, drop your picks for the most infamous and nefarious moments in the comments below!
—Nick Caruso, TVLine, 30 May 2025
See All Example Sentences for nefarious
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Dan Goodin, ArsTechnica, 6 June 2025
The show follows Royal Newfoundland Constabulary Inspector, Donny ‘Fitz’ Fitzpatrick, who digs too deeply into a local politician’s nefarious activity, and is exiled to work in Saint-Pierre et Miquelon.
—Jesse Whittock, Deadline, 4 June 2025
Around the world, nefarious state and nonstate actors are extracting enormous value from forests to fund their operations.
—Justyna Gudzowska, Foreign Affairs, 2 June 2025
If not, drop your picks for the most infamous and nefarious moments in the comments below!
—Nick Caruso, TVLine, 30 May 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 12 Jun. 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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