κρεῖττον σιωπᾶν ἐστιν ἢ λαλεῖν μάτην → it's better to keep silence than to speak without reason (Menander)
ἀσέλγημα, ὕβρισμα, ὕβρις, ἀκολασία, ἀσέλγεια, ἀκολάστημα