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Douglas Harper's Etymology Dictionary

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.

The Collaborative International Dictionary

Mendacious

Mendacious \Men*da"cious\, a. [L. mendax, -acis, lying, cf. mentiri to lie.]

  1. Given to deception or falsehood; lying; as, a mendacious person.

  2. False; counterfeit; containing falsehood; as, a mendacious statement. [1913 Webster] -- Men*da"cious*ly, adv. -- Men*da"cious*ness, n.

Longman Dictionary of Contemporary English

mendacious

adjective
EXAMPLES FROM OTHER ENTRIES
▪ a secretive and mendacious government
EXAMPLES FROM CORPUS
▪ But Legasov's reassurance at Vienna was not as mendacious as many believed.
▪ If they carry on confounding chronology in this mendacious manner, they are likely to hit 30 as I reach 60.
WordNet

mendacious

  1. adj. given to lying; "a lying witness"; "a mendacious child" [syn: lying(a)]

  2. intentionally untrue; "a mendacious statement"

Wiktionary

mendacious

a. 1 (context of a person English) lying, untruthful or dishonest. 2 (context of a statement etc English) false or untrue.

Usage examples of "mendacious".

Now that he had money in his hand again, the landlord assumed a mendacious cordiality.

I will place the resources of this household at your disposal to aid in any and all ways possible to secure the release and total exoneration of my mistress as well as demanding and receiving damages for what she has had to endure on these false and mendacious charges.

But assurances were offered, however mendacious, because no one wanted the merchants to flee.

Summon the twenty drops of blood that trickle round thy lank and withered frame and let them mount to thy mendacious cheek!

And you, Luterin, how unpleasant to be recalled from the dead to mingle with the same mendacious crowdolder, greedier.

Daniel of Kiev in himself is a very ordinary and rather mendacious traveller, a harmless, devout pilgrim, as careless in all matters of fact as Antonine the Martyr.

Russians and others who saw its content as a threat to their geopolitical interests and its democratizing language as arrogant, mendacious and hypocritical.

He would almost certainly never have become President, of course, if he had not become a national figure as the discoverer and hounder of the mendacious Leland Clewes.

Tev had pulled more than his share of boneheaded moves over the past several months, but suggesting to the insulated, unknowing colony that they openly invite in the dangerous, mendacious, technology scavengers took the cake.