Here are some ways you can use "mendacity" in a sentence:
1. Describing a person or their actions:
* "The politician's campaign was built on a foundation of mendacity."
* "Her mendacity was evident in every word she spoke."
* "He was known for his mendacity, making it difficult to trust anything he said."
2. Discussing a situation or event:
* "The report exposed the mendacity of the government's claims."
* "The scandal revealed a culture of mendacity within the organization."
* "Mendacity has become a pervasive problem in modern society."
3. As a synonym for other words:
* "His lies were a clear sign of his mendacity."
* "The investigation uncovered a web of deceit and mendacity."
Remember, using "mendacity" suggests a strong accusation of dishonesty. Use it carefully and only when you are certain of its validity.