What does mendacious mean?
Mendacious is a formal adjective meaning untruthful, deceitful, and inclined to lie. It is used especially of statements, claims, accounts, publicity, and people whose speech is deliberately misleading. Unlike a neutral description of an inaccurate statement, the word carries a strong judgment that dishonesty is involved, whether in a particular remark or in a broader pattern of conduct. Mendacious language is therefore common in political and legal argument, where it helps identify propaganda, false accusations, and deliberately deceptive accounts. Its Latin roots connect it with mendacity, a noun meaning the habit or quality of lying, and with the broader English vocabulary of truthfulness and falsity. Mendacious is also related in sound and suffix to words such as veracious, meaning truthful, but its force is distinctly more accusatory: veracious praises accuracy, whereas mendacious condemns deliberate untruthfulness.
adjectiveDishonest and untruthful; given to lying. It can describe a person, statement, account, or other form of communication that deliberately misrepresents the truth.
- Untruthful or given to lying; deliberately deceptive.
"The spokesperson dismissed the report as mendacious and politically motivated."
"The newspaper accused the official of making mendacious claims about the program's performance."
"His mendacious account of the incident was quickly contradicted by several witnesses."
From the Latin mendax, meaning false or lying, mendacious describes language whose central feature is its departure from truth.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does mendacious come from?
Mendacious comes through French from Latin mendacius, meaning false, deceitful, or given to lying. Its source is the Latin root mendax, meaning false or deceptive, which also underlies mendacium, a lie or deceit. English borrowed the word in the early 17th century, and related forms such as mendacity developed from the same Latin foundation.
Related word forms
How mendacious is actually used
This is a formal and strongly negative word, commonly used in legal, political, and journalistic contexts. It suggests dishonesty or deliberate misrepresentation rather than an accidental mistake, and is often more pointed than simply saying that something is false.
Easily confused with mendacious
Mendacious means untruthful or deceitful, whereas a mendicant is a beggar or someone who lives by begging.