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mendacious

[men-dey-shuh s] /mɛnˈdeɪ ʃəs/
adjective
1.
telling lies, especially habitually; dishonest; lying; untruthful:
a mendacious person.
2.
false or untrue:
a mendacious report.
Origin of mendacious
1610-1620
1610-20; < Latin mendāci- (see mendacity) + -ous
Related forms
mendaciously, adverb
mendaciousness, noun
unmendacious, adjective
unmendaciously, adverb
Antonyms
1, 2. veracious.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Word Origin and History for mendaciousness

mendacious

adj.

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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