ἀθυμεῖν
From LSJ
Ὥσπερ οἱ ἐρωτικοὶ ἀπὸ τῶν ἐν αἰσθήσει καλῶν ὁδῷ προϊόντες ἐπ' αὐτὴν καταντῶσι τὴν μίαν τῶν καλῶν πάντων καὶ νοητῶν ἀρχήν → Just as lovers systematically leave behind what is fair to sensation and attain the one true source of all that is fair and intelligible
Greek > English (Woodhouse Verbs Reversed)
(see also ἀθυμέω): dejected, despond, be cast down, be dejected, be depressed, be discouraged, be disheartened, be in low spirits, be melancholy, be sad, be sorrowful, lose courage, lose heart