Mendacity as a habit means someone consistently lies or avoids the truth. The politician's mendacity was evident in every promise he failed to keep.
Pro Tip 2/3
Negative Connotation
Mendacity has a negative implication, suggesting moral disapproval of lying. The teacher scolded the student for his mendacity during the examination.
Pro Tip 3/3
Not Accidental
Mendacity involves intentional lying, not just being incorrect by mistake. Her mendacity about her qualifications got her into trouble when the truth came out.