men·dac·i·ty 
/mɛnˈdæsəti/ noun
/mɛnˈdæsəti/ noun [noncount] formal : lack of honesty : the condition of being mendacious
▪ The people learned of their government's mendacity [=learned that their government had told lies] only after the war had ended.
▪ The people learned of their government's mendacity [=learned that their government had told lies] only after the war had ended.
