εἰς πέλαγος σπέρµα βαλεῖν καὶ γράµµατα γράψαι ἀµφότερος µόχθος τε κενὸς καὶ πρᾶξις ἄκαρπος → throwing seeds and writing letters at sea are both a vain and fruitless endeavor
adj.
P. and V. ἄθυμος (Xen.), V. δύσθυμος, κατηφής, δύσφρων.
Be depressed, v.: P. and V. ἀθυμεῖν, δυσθυμεῖσθαι.