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
Looking to grow your vocabulary? Check out this interactive, curated word list from our team of English language specialists at Vocabulary.com – one of over 17,000 lists we've built to help learners worldwide!
Even More Negative Words to Describe a Person
Interested in learning more words like this one? Our team at Vocabulary.com has got you covered! You can review flashcards, quiz yourself, practice spelling, and more – and it's all completely free to use!
Coraline
Want to remember this word for good? Start your learning journey today with our library of interactive, themed word lists built by the experts at Vocabulary.com – we'll help you make the most of your study time!
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.
Some requests, like how to jump a motorcycle over a trench, are not necessarily nefarious in nature.
From Barron's ● Jul. 13, 2026
“Some children might say that the new spouse has nefarious intent,” said Jim Crider, a certified financial planner in New Braunfels, Texas.
From MarketWatch ● Jun. 30, 2026
Rico’s assistance comes at a price: Kendal must assist a fledgling agent who’s infiltrated a secretive and seemingly nefarious tech company.
From The Wall Street Journal ● Jun. 5, 2026
Both his loyal supporters and well-financed critics have a hard time explaining Becerra’s rapid ascent, with theories ranging from outright luck to a nefarious social media push.
From Los Angeles Times ● Jun. 1, 2026
What she had made was called a grappling hook, which is something used for climbing up the sides of buildings, usually for a nefarious purpose.
From "The Bad Beginning" by Lemony Snicket
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.