出典:Wiktionary
From Late Latin mendacitas [1], from Latin mendāx (“deceitful, deceptive, lying”) + -itās (“suffix forming nouns indicating a state of being”). Mendāx is derived from mentior (“to deceive, lie”) (from mēns, mentis (“mind; intellect; judgment, reasoning”), from Proto-Indo-European *méntis (“thought”)) + -āx (“suffix forming adjectives expressing a tendency または inclination”), or from Proto-Indo-European *mend- (“to fault”).
mendacity (countable かつ uncountable, 複数形 mendacities)