• (RP) IPA: /mɛnˈdæsəti/
• (GA) IPA: /mɛnˈdæsəti/, [-ɾi]

mendacity

1. (uncountable) The fact or condition of being untruthful; dishonesty.
   • 1843, John Stuart Mill, “Of the Grounds of Disbelief”, in A System of Logic, Ratiocinative and Inductive, being a Connected View of the Principles of Evidence, and the Methods of Scientific Investigation. [...] In Two Volumes, volume II, London: John W[illiam] Parker, […], OCLC 156109929 ↗, § 5, page 196 ↗:

     {...}} Treating the assertion of the witness as the effect, he [{{w

   • 1955 March 24 (first performance), Tennessee Williams [pseudonym; Thomas Lanier Williams III], Cat on a Hot Tin Roof, published in Jack Gaver, editor, Critics’ Choice: New York Drama Critics’ Circle Prize Plays 1935–55, New York, N.Y.: Hawthorn Books, 1955, OCLC 726450058, Act II, page 652 ↗, column 2:

     Big Daddy: […] Think of all the lies I got to put up with!—Pretenses! Ain't that mendacity? Having to pretend stuff you don't think or feel or have any idea of?

2. (countable) A deceit, falsehood, or lie#Noun|lie.
   • 2018: "Donald Trump’s Fake News Mistake" by Jack Shafer, Politico

     He would have you believe that every error we make is deliberate, that journalists have somehow ginned up a unified conspiracy of lies and mendacities against him.

• mendacious
• mendaciously
• mendaciousness

• German: Verlogenheit
• Italian: mendacità
• Portuguese: mendacidade, falsidade
• Russian: лжи́вость
• Spanish: mendacidad

• German: Unwahrheit
• Italian: bugia, menzogna, falsità, mendacità
• Portuguese: mendacidade, falsidade
• Russian: ложь
• Spanish: mentira