σιγᾶν ἄμεινον ἢ λαλεῖν ἃ μὴ πρέπει → it's better to keep silence than to say what's not appropriate (Menander)
P. and V. φιλαίτιος, φιλόψογος (Plato).
you are censorious towards your friends: ἐπίμομφος εἶ φίλοις (Euripides, Rhesus 327).
