As adjectives the difference between mendacious and duplicitous
is that mendacious is (of a person) lying, untruthful or dishonest while duplicitous is given to or marked by deliberate deceptiveness in behavior or speech.
mendacious
English
Adjective
(
en adjective)
(of a person) Lying, untruthful or dishonest.
(of a statement etc) False or untrue.
duplicitous
English
Adjective
(
en adjective)
Given to or marked by deliberate deceptiveness in behavior or speech.
Synonyms
* deceitful, double-dealing, two-faced
Related terms
* duplicate
* duplicitously
* duplicitousness
* duplicity