Synonyms of nefarious

nefarious

adjective

ni-ˈfer-ē-əs 

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

• evil
• unlawful
• immoral
• sinful
• vicious
• vile
• dark
• bad
• wicked
• villainous
• infamous
• rotten
• unethical
• corrupt
• wrong
• obscene
• iniquitous
• unsavory
• illegal
• unauthorized
• cruel
• improper
• offensive
• ugly
• unrighteous
• dirty
• nasty
• cursed
• sordid
• disreputable
• contemptible
• despicable
• ignoble
• infernal
• prohibited
• condemned
• naughty
• pernicious
• depraved
• forbidden
• reprehensible
• dishonest
• objectionable
• perverted
• atrocious
• unscrupulous
• ill
• noxious
• mean
• sick
• snide
• ungodly
• evil-minded
• unwholesome
• debauched
• unhealthy
• incorrect
• base
• censurable
• pestilential
• dissolute
• degenerate
• debased
• blameworthy
• scrofulous
• fallen
• libertine
• unseemly
• unprincipled
• loose
• proscribed
• miserable
• outlawed
• wretched
• unclean
• execrable
• barred
• dishonorable
• low-minded
• indecent
• discouraged
• errant
• low
• vulgar
• lousy
• blamable
• reprobate
• disallowed
• unbecoming
• indecorous
• erring
• cussed
• banned
• interdicted
• defiling

Antonyms & Near Antonyms

• moral
• good
• legitimate
• ethical
• honorable
• noble
• virtuous
• right
• legal
• righteous
• decent
• sublime
• high
• honest
• lofty
• scrupulous
• just
• reputable
• permissible
• upright
• permitted
• elevated
• principled
• authorized
• licensed
• endorsed
• proper
• approved
• high-minded
• sanctioned
• correct
• promoted
• allowed
• decent
• supported
• exemplary
• clean
• innocent
• pure
• perfect
• seemly
• white
• law-abiding
• decorous
• commendable
• creditable
• wholesome
• encouraged
• worthy
• blameless
• guiltless
• unobjectionable
• abetted
• venerable
• immaculate
• inoffensive
• incorruptible
• irreproachable
• spotless
• esteemed
• chaste
• uncorrupted
• respected
• unerring
• squeaky-clean
• lily-white
• unfallen
• upstanding

Synonym Chooser

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

Recent Examples of nefarious

Adapted from Cornelia Funke’s beloved children’s book of the same name, Laura Crook Waxdal, Mark Hartman and John Kielty’s version transports the audience to the North Pole where nefarious forces look to remove the magic from and insert some capitalism into Christmas. —Jed Gottlieb, Boston Herald, 1 May 2026

What remains intact is Orwell’s message about nefarious business models that stress profit over people. —Randy Myers, Mercury News, 30 Apr. 2026

Propaganda, in the 1920s and 1930s, was not seen as a nefarious concept. —Literary Hub, 27 Apr. 2026

Now, in return for the $300 million investment that will keep Hypergnosis afloat, Carl expects immediate benefits from Duncan’s nefarious data-collection operation. —Scott Tobias, Vulture, 26 Apr. 2026

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