1. Characterized by deception or falsehood: When Steven received an "A+" (excellent grade) on his final exam, although his grade point average was a "D" (barely-passing grade), his teacher, Mrs. Straight, became very suspicious. When she had a serious talk with Steven, he admitted his mendaciousness by explaining that he found a copy of the teacher's test which she had accidentally left in a textbook that she had loaned to him one day when he left his at home.

A CEO (Chief Executive Officer) of a chain of department stores was sentenced to three years of prison for the mendaciousness of using company money for private purposes.

2. Divergence from absolute truth: The defiant mayor of the city continued with his mendaciousness even after the police confirmed that they had a video of him smoking crack which he repeatedly denied.