entelechia
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
Latin > English (Lewis & Short)
entĕlĕchīa: ae, f., = ἐντελέχεια, in the lang. of the Aristotelian philosophy,
I actuality, Tert. Anim. 32; Macr. Somn. Scip. 1, 14; cf. Cic. Tusc. 1, 10, 22 (v. Lidd. and Scott, s. v. ἐντελέχεια).