1. given to or characterized by deception or falsehood; lying
Usage: formal

Examples

• The politician’s mendacious statements were exposed by investigative journalists.
• She grew tired of his mendacious excuses for being late.
• The witness gave mendacious testimony that contradicted the evidence.
• His mendacious nature made it impossible to trust anything he said.
• The company issued a mendacious press release to cover up the scandal.
• Critics accused the author of writing a mendacious memoir filled with fabrications.