nefarious
Americanadjective
adjective
Other Word Forms
Etymology
Origin of nefarious
First recorded in 1595–1605; from Latin nefārius “wicked, vile,” equivalent to nefās “offense against divine or moral law” (from ne-, negative prefix + fās “law, right”) + -ius -ious
Explanation
Describe a person's actions as nefarious if they are evil or wicked. Batman and Superman are always fighting evildoers and stopping their nefarious plots. Nefarious comes from the Latin nefas "crime, impiety." If something is nefarious, it is criminal, evil, malicious and wicked. Thinking of superheroes can help you remember the meaning of the word, but it is often used in much less exciting circumstances. News reporters investigate corrupt politicians in order to uncover the nefarious activities. And, if you don't pay for your downloaded music, you have gotten it by nefarious means.
Vocabulary lists containing nefarious
Grade 9, List 4
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Adopting a comedic conspiratorial tone, he leans in to reveal: "The scene I'm filming tonight, I'm doing something slightly nefarious in some bushes outside. Which could mean anything in this show, frankly."
From BBC • May 13, 2026
By August, when Tzagournis’ daughter first saw it at a friend’s house, the movie about three glamorous K-pop stars doubling as brave warriors to defeat nefarious demons had become Netflix’s most-watched movie ever.
From Los Angeles Times • Apr. 29, 2026
Here, siblings Mario and Luigi team with Princess Peach and Toad on an interstellar adventure and face off against the nefarious fire-breathing Bowser and his son.
From The Wall Street Journal • Mar. 29, 2026
Related: ‘Could a nefarious caregiver steal her money?’
From MarketWatch • Mar. 19, 2026
"Before the nefarious Dr. Loofah puts the microchip in his back!" barks Scruffy.
From "Dog Squad" by Chris Grabenstein
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
