ἢ λέγε τι σιγῆς κρεῖττον ἢ σιγὴν ἔχε → either say something better than silence or keep silence (Menander)
P. and V. ἀθυμία, ἡ, δυσθυμία, ἡ (Plato).
blame: P. and V. μέμψις, ἡ.
dissuasion: P. ἀποτροπή, ἡ.