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

However, these technological advances are not widely deployed due in part to concerns from privacy activists, who maintain they necessitate backdoors that could be exploited by governments and nefarious actors to enable wholesale spying. — Charlie Campbell, Time, 20 July 2026

Texas Tech’s Board of Regents Chairman Cody Campbell says there was nothing nefarious about a June donation to Attorney General Ken Paxton’s Senate campaign. — Eleanor Dearman, Fort Worth Star-Telegram, 18 July 2026

But the others have each been marked by some kind of controversy caused by the supposedly nefarious actions of an Argentina player. — Nick Miller, New York Times, 14 July 2026

Prosecutors told jurors at trial that the group’s actions — including bringing firearms, first aid kits and wearing body armor — signaled nefarious intent. — Jamie Stengle, Los Angeles Times, 1 July 2026

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