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If you need a fancy word to describe someone who’s up to no good, nefarious has got you (and them) covered. It’s also handy for characterizing the “no good” such a dastardly devil gets up to, as in “a nefarious business/plot/deed.” Nefarious is most often used for someone or something that is flagrantly wicked or corrupt—it’s more applicable to the mustache-twirling supervillain than the morally gray antihero. In other words, there’s no question that a nefarious scheme, or schemer, is not right. Etymologically, this makes perfect sense: nefarious can be traced back to the Latin noun nefas, meaning “crime,” which in turn combines ne- (“not”) and fas, meaning “right” or “divine law.” It is one of very few English words with this root, accompanied only by the likes of nefariousness and the thoroughly obscure nefast (“wicked”).
Examples of nefarious in a Sentence
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
Sydney Bucksbaum, Entertainment Weekly, 10 Feb. 2026
That specifically relates to Rob, who is keeping a lot of secrets that may or may not be nefarious.
—Los Angeles Times, 8 Feb. 2026
This idea that America is a nefarious and terrible force in the world that has committed myriad sins and must withdraw from the world, both for its own good and for the good of the world.
—David Remnick, New Yorker, 6 Feb. 2026
As the doppelganger charms the internet and devises a nefarious plot to replace mankind with brainrot, Shiori must partner with other online outcasts to stop her digital counterpart and reclaim her life in the real world.
—Jazz Tangcay, Variety, 5 Feb. 2026
See All Example Sentences for nefarious
Cite this Entry
“Nefarious.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/nefarious. Accessed 15 Feb. 2026.
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nefarious
adjective
