ἀθυμητέον
From LSJ
οὕτω τι βαθὺ καὶ μυστηριῶδες ἡ σιγὴ καὶ νηφάλιον, ἡ δὲ μέθη λάλον → silence is something profound and mysterious and sober, but drunkenness chatters
English (LSJ)
A one must lose heart, X.An.3.2.23; οὐκ ἀ. τοῖς παροῦσι πράγμασιν D.4.2.