Mendacious – Not telling the truth; lying
The men slept during the day in a corner of the spacious (mendacious) warehouse when they should have been working. They were asked if they worked today and they were lying when they said 'yes'.
Examples of mendacious in a sentence
The mendacious report exaggerated their sales figures.
The mendacious conman made a living from tricking people.
He is mendacious about his vegetarianism because he eats chicken.