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 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 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 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 After a similarly poor, though far less mendacious, performance from Biden in the Presidential debate, leaders in his party demanded that the President exit the race. Susan B. Glasser, The New Yorker, 8 Aug. 2024 See All Example Sentences for mendacious
Recent Examples of Synonyms for mendacious
Adjective
  • Avoid generic, spammy tactics, over-automation or dishonest ploys.
    Samuel Darwin, Forbes.com, 24 June 2025
  • The reasons for such concerns start with the shockingly dishonest campaign for Proposition 1A, the 2008 state ballot measure allocating $9.95 billion in bond seed money for a network of bullet trains linking Los Angeles and San Francisco.
    U T Editorial Board, San Diego Union-Tribune, 20 June 2025
Adjective
  • However, this setup is relatively inflexible, as minor displacements or changes require recalibration, often resulting in erroneous test results.
    Prasad Banala, Forbes.com, 17 June 2025
  • Thursday, the Cubs jumped the gun and announced the new pope was a fan on their Wrigley Field marquee after an erroneous report on ABC.
    Jon Greenberg, New York Times, 14 May 2025
Adjective
  • The document discovery in those cases revealed that France had been untruthful during the NFLPA arbitration process.
    Chris Deubert, Forbes.com, 31 May 2025
  • During the trial, prosecutors showed videos of the multiple interviews Troconis had with law enforcement and accused her of being untruthful about Farber Dulos’ disappearance.
    Justin Muszynski, Hartford Courant, 21 Apr. 2025
Adjective
  • This was a false charge by the Bush administration, as the United Nations’ inspectors on the ground in Iraq tried to communicate to Bush, and as his intelligence agencies tried to tell him.
    Tom Zirpoli, Baltimore Sun, 24 June 2025
  • But an investigation resulted in an astonishing call from the other side of the world, which revealed that ‘The GPO Girl’ was, in fact, a 25-year-old Australian, who has created more than 100 false identities.
    Max Goldbart, Deadline, 24 June 2025

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Cite this Entry

“Mendacious.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/mendacious. Accessed 3 Jul. 2025.

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