mendacious

[men-dey-shuhs]
adjective
1.
telling lies, especially habitually; dishonest; lying; untruthful: a mendacious person.
2.
false or untrue: a mendacious report.

Origin:
1610–20; < Latin mendāci- (see mendacity) + -ous

mendaciously, adverb
mendaciousness, noun
unmendacious, adjective
unmendaciously, adverb


1, 2. veracious.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mendacity (mɛnˈdæsɪtɪ)
 
n , pl -ties
1.  the tendency to be untruthful
2.  a falsehood
 
[C17: from Late Latin mendācitās, from Latin mendāx untruthful]
 
mendacious
 
adj
 
men'daciously
 
adv
 
men'daciousness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

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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Example sentences
Rumor is an evanescent and mendacious tatterdemalion.
This is disingenuous or possibly mendacious of you.
Yes, much of their output is tendentious, unbalanced or downright mendacious.
You are being mendacious and misrepresentative.
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