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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
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. 2014.
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Word Origin and History for unmendacious
mendacious
1610s, from M.Fr. mendacieux, from L. mendacium "a lie," from mendax (gen. mendacis) "lying, deceitful," related to menda "fault, defect, carelessness in writing" (cf. amend, mendicant), from PIE base *mend- "physical defect, fault." The sense evolution of mendax influenced by mentiri "to speak falsely, lie, deceive."
Online Etymology Dictionary, © 2010 Douglas Harper
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