ἡ κέρκος τῇ ἀλώπεκι μαρτυρεῖ → you can tell a fox by its tail, small traits give the clue to the character of a person
lightness, substantive P. κουφότης, ἡ (Plato), ἐλαφρότης, ἡ (Plato).
lightness of conduct: P. and V. ὕβρις, ἡ.