Lacking authenticity or validity in essence or origin; not genuine:
Not faithful or loyal
Uttering falsehood; dishonest or deceitful.
Tending to deceive; apt to lie or cheat
The definition of dishonest is a person who cheats or lies.
The definition of lying is not telling the truth.
Characterized by truth; not false:
Corresponding to reality; true.
Find another word for mendacious. In this page you can discover 20 synonyms, antonyms, idiomatic expressions, and related words for mendacious, like: spurious, untrue, self-serving, frank, sycophantic, false, deceitful, dishonest, fibbing, lying and untruthful.