Synonym Chooser

How does the adjective mendacious differ from other similar words?

Some common synonyms of mendacious are deceitful, dishonest, and untruthful. While all these words mean "unworthy of trust or belief," mendacious may suggest bland or even harmlessly mischievous deceit and when used of people often suggests a habit of telling untruths.

mendacious tales of adventure

When is deceitful a more appropriate choice than mendacious?

The words deceitful and mendacious are synonyms, but do differ in nuance. Specifically, deceitful usually implies an intent to mislead and commonly suggests a false appearance or double-dealing.

the secret affairs of a deceitful spouse

When might dishonest be a better fit than mendacious?

In some situations, the words dishonest and mendacious are roughly equivalent. However, dishonest implies a willful perversion of truth in order to deceive, cheat, or defraud.

a swindle usually involves two dishonest people

In what contexts can untruthful take the place of mendacious?

The meanings of untruthful and mendacious largely overlap; however, untruthful stresses a discrepancy between what is said and fact or reality.

an untruthful account of their actions

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 mendacious Trump’s contrived veneer is being ripped away to reveal an immoral, mendacious, transactional opportunist, without a shred of loyalty to anyone or anything but himself. Sun Sentinel Editorial Board, Sun Sentinel, 21 Mar. 2025 Her unsettling command of the character — who was equal parts sweet, vulnerable, mendacious, and menacing — was one of the highlights of the series. Jake Kanter, Deadline, 24 Dec. 2024 The candidate vying for a second White House stint — in the midst of his third overall campaign — has accumulated a long list of acts who do not want to be associated with his divisive, frequently mendacious rhetoric. Gil Kaufman, Billboard, 15 Oct. 2024 Two stand out: his profile and endorsement, in 2000, of Ralph Nader’s independent presidential campaign, and his early opposition to George W. Bush’s disastrous and mendacious invasion of Iraq. Yiyun Li, Harper's Magazine, 23 Sep. 2024 See All Example Sentences for mendacious
Recent Examples of Synonyms for mendacious
Adjective
  • Trump has initiated a flurry of defamation lawsuits against media companies, accusing them of false or misleading coverage.
    Anniek Bao, CNBC, 16 Sep. 2025
  • In a recent interview with the Financial Times, Hinton challenged the optimistic visions promoted by Silicon Valley leaders, suggesting that much of the upbeat narrative about AI’s societal benefits is, at best, misleading.
    Tim Bajarin, Forbes.com, 16 Sep. 2025
Adjective
  • These are cheap, dishonest shots against a great intellect, acknowledged by friends and opponents alike.
    James Gaylord, Oc Register, 15 Sep. 2025
  • Industry groups insist that they are committed to weeding out dishonest companies that make false claims or sell dangerous products.
    Suzy Khimm, NBC news, 26 Aug. 2025
Adjective
  • It must also be said that, for all the lamenting of the Netherlands’ failure to win, West Germany — and Muller — were robbed of a clear goal in the second half due to an erroneous offside flag.
    Michael Cox, New York Times, 14 Sep. 2025
  • On Thursday, an erroneous report of a man with a gun sent two Boulder schools into lockdown.
    Seth Klamann, Denver Post, 12 Sep. 2025
Adjective
  • Officers making contact with Hyatt noted an odor of intoxicants, staggering gait, confusion and illogical, untruthful responses to questions, according to the motion.
    Arkansas Online, Arkansas Online, 18 Aug. 2025
  • The deficient vice of integrity is being fake, untruthful, inconsistent, unprincipled, and manipulative.
    Mary Crossan, Forbes.com, 17 July 2025
Adjective
  • He was found dead lying face up on his hotel bed with no signs of trauma, according to a Monday report from the Orange County Sheriff’s Office in Florida.
    Kenan Draughorne, Los Angeles Times, 14 Jan. 2022
Adjective
  • The false assurance was more than a slip.
    Eric Tucker, Twin Cities, 13 Sep. 2025
  • Robinson, the founder of the now-defunct anti-immigration English Defence League (EDL), was released from prison earlier this year, having been jailed for being in contempt of court by repeating false accusations about a Syrian refugee.
    Catherine Nicholls, CNN Money, 13 Sep. 2025

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Cite this Entry

“Mendacious.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/mendacious. Accessed 19 Sep. 2025.

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