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[men-dey-shuh s] /mɛnˈdeɪ ʃəs/
telling lies, especially habitually; dishonest; lying; untruthful:
a mendacious person.
false or untrue:
a mendacious report.
Origin of mendacious
1610-20; < Latin mendāci- (see mendacity) + -ous
Related forms
mendaciously, adverb
mendaciousness, noun
unmendacious, adjective
unmendaciously, adverb
1, 2. veracious. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for mendacious
Contemporary Examples
Historical Examples
  • Party journalism in the Province of Quebec is peculiarly bitter and mendacious.

    The Hunted Outlaw Anonymous
  • Bein' a woman, you're too feeble-witted for reason, too mendacious for trooth.'

    Faro Nell and Her Friends Alfred Henry Lewis
  • With this mendacious explanation Gustavus was forced to be content.

  • The mendacious fiction was framed by the chief priests and elders of the people.

    Jesus the Christ James Edward Talmage
  • Angie said suddenly and turned with a mendacious inspiration on her brother.

    The Fifth Ace

    Douglas Grant
Word Origin and History for mendacious

1610s, from Middle French mendacieux, from Latin mendacium "a lie, untruth, falsehood, fiction," from mendax (genitive mendacis) "lying, deceitful," from menda "fault, defect, carelessness in writing," from PIE root *mend- "physical defect, fault" (see amend (v.)). The sense evolution of Latin mendax was influenced by mentiri "to speak falsely, lie, deceive." Related: Mendaciously; mendaciousness.

Online Etymology Dictionary, © 2010 Douglas Harper
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