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1. Untruthfulness; tendency to lie
2. Falsehood or deception
1. Lex Luthor's mendacity knew no bounds when it came to his schemes against Superman.
2. The mendacity in Loki's smile alerted Thor that his brother was up to no good.
3. In the movie 'The Invention of Lying,' the protagonist's sudden ability to lie introduces the concept of mendacity to a society that always tells the truth.
4. Nobita was often troubled by the mendacity of his tall tales, especially when Doraemon was not around to help him out.