noun, plural men·dac·i·ties for 2.
- the quality of being mendacious; untruthfulness; tendency to lie.
- an instance of lying; falsehood.
noun plural -ties
- the tendency to be untruthful
- a falsehood
n.“tendency to lie,” 1640s, from Middle French mendacité and directly from Late Latin mendacitas “falsehood, mendacity,” from Latin mendax “lying; a liar” (see mendacious).