Definition of nefariousnext
as in evil
not conforming to a high moral standard; morally unacceptable the chaste heroines and nefarious villains of old-time melodramas

Synonyms & Similar Words

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Antonyms & Near Antonyms

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How does the adjective nefarious differ from other similar words?

Some common synonyms of nefarious are corrupt, degenerate, iniquitous, vicious, and villainous. While all these words mean "highly reprehensible or offensive in character, nature, or conduct," nefarious suggests flagrant breaching of time-honored laws and traditions of conduct.

the nefarious rackets of organized crime

Where would corrupt be a reasonable alternative to nefarious?

While in some cases nearly identical to nefarious, corrupt stresses a loss of moral integrity or probity causing betrayal of principle or sworn obligations.

city hall was rife with corrupt politicians

When could degenerate be used to replace nefarious?

In some situations, the words degenerate and nefarious are roughly equivalent. However, degenerate suggests having sunk to an especially vicious or enervated condition.

a degenerate regime propped up by foreign powers

When can iniquitous be used instead of nefarious?

The words iniquitous and nefarious are synonyms, but do differ in nuance. Specifically, iniquitous implies absence of all signs of justice or fairness.

an iniquitous system of taxation

When might vicious be a better fit than nefarious?

The meanings of vicious and nefarious largely overlap; however, vicious may directly oppose virtuous in implying moral depravity, or may connote malignancy, cruelty, or destructive violence.

a vicious gangster

When would villainous be a good substitute for nefarious?

While the synonyms villainous and nefarious are close in meaning, villainous applies to any evil, depraved, or vile conduct or characteristic.

a villainous assault

Example Sentences

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Recent Examples of nefarious After German terrorists — led by the nefarious Hans Gruber (Alan Rickman) — take control of the building where Holly's company's Christmas party is being held, holding her and her co-workers hostage, McClane must work to take down the terrorists from the inside to save his family. Ilana Gordon, Entertainment Weekly, 29 Dec. 2025 This hypothetical, far from alleviating concerns about leaks, illustrates the potential for infinitely more nefarious scenarios, involving human viruses. Andrew Noymer, Oc Register, 24 Dec. 2025 However, beneath the surface, more nefarious deeds are at play. Rebecca Aizin, PEOPLE, 20 Dec. 2025 Soon, strange encounters with the townspeople, a nightly demonic visitor, and whispers of a secret church ceremony fuel Hannah’s fear that something more nefarious is at hand. Borys Kit, HollywoodReporter, 4 Dec. 2025 See All Example Sentences for nefarious
Recent Examples of Synonyms for nefarious
Adjective
  • Like terrestrial monsters, evil aliens are often stand-ins for real-life anxieties.
    Alan Bradley, Space.com, 8 Nov. 2025
  • Thia was sent to this dread planet by the Weyland-Yutani corporation, the famously evil entity that haunts most of the Alien movies.
    Richard Lawson, HollywoodReporter, 4 Nov. 2025
Adjective
  • Troopers also seized an unregistered gun and ammunition from Cook, who is charged with trafficking 200 grams or more of cocaine, as well as unlawful possession of a firearm and ammunition.
    Tim Dunn, Boston Herald, 6 Jan. 2026
  • But once those moratoriums ended in 2023, unlawful detainers (a type of notice that can lead to eviction) doubled from June 2022 to June 2023.
    Saumya Roy, The Dial, 6 Jan. 2026
Adjective
  • In addition to being immoral, CFA’s support for BDS likely violates state law, AB 2844, which prohibits California from contracting with entities that engage in discrimination, including against Jews or Israelis.
    Mark Pinkert, Oc Register, 23 Dec. 2025
  • The film follows the deliciously immoral, widowed Lady Susan Vernon (Kate Beckinsale), who maneuvers, deceives and seduces her way through London and across her relatives' country estates in an effort to find a wealthy husband for herself and her daughter, Frederica (Morfydd Clark).
    Andrea Wurzburger, PEOPLE, 29 Nov. 2025
Adjective
  • Gettin’ sinful all of a sudden.
    David Searcy, Harpers Magazine, 30 Dec. 2025
  • Tantric cultural and spiritual traditions, which began to emerge in the early centuries of the Common Era, take a positive perspective on the material world in general and the human body in particular, as opposed to traditions that regard both as inherently illusory or sinful.
    Anya Foxen, The Conversation, 9 Dec. 2025
Adjective
  • Officials charged Damon Leanord of Pleasanton, Kansas, with interference with law enforcement, having a vicious dog at large and criminal desecration of a body in Linn County and abandonment of a corpse charges in Bates County, Missouri, after finding the child’s body at the bottom of a creek bed.
    Sofi Zeman January 6, Kansas City Star, 6 Jan. 2026
  • He was shocked in 2013 when he was struck by vicious bouts of vomiting.
    Robert McCoppin, Chicago Tribune, 5 Jan. 2026
Adjective
  • Players have faced vile fan reactions and even death threats for their failure to satisfy bettors in the moment.
    Sally Jenkins, The Atlantic, 26 Oct. 2025
  • The Minnesota Vikings condemned the vile racist message defensive back Isaiah Rodgers received following the team’s 28-22 loss to the Philadelphia Eagles.
    Ryan Gaydos, FOXNews.com, 21 Oct. 2025
Adjective
  • Don't feel afraid to play with bold (but dark) colors and various materials.
    Ashlyn Needham, The Spruce, 8 Jan. 2026
  • Open my soul to the vast dark places.
    Gwen Faulkenberry, Arkansas Online, 8 Jan. 2026
Adjective
  • Iran is facing its worst drought in decades, raising fears of evacuations in Tehran while threatening the regime’s stability and nuclear ambitions, according to a leading environmental expert.
    Emma Bussey, FOXNews.com, 10 Nov. 2025
  • Keeping bad things out of my body.
    Literary Hub, Literary Hub, 10 Nov. 2025

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Cite this Entry

“Nefarious.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/nefarious. Accessed 12 Jan. 2026.

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