MENDACIOUS
mendacious
(adjective) given to lying; “a mendacious child”
mendacious
(adjective) intentionally untrue; “a mendacious statement”
Source: WordNet® 3.1
Etymology
Adjective
mendacious (comparative more mendacious, superlative most mendacious)
(of a person) Lying, untruthful or dishonest.
(of a statement, etc) False or untrue.
Source: Wiktionary
Men*da"cious, a. Etym: [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.
– Men*da"cious*ly, adv.
– Men*da"cious*ness, n.
Source: Webster’s Unabridged Dictionary 1913 Edition