εὐηθίζεσθαι
From LSJ
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
Greek > English (Woodhouse Verbs Reversed)
play the fool (see also: εὐηθίζομαι)