briskness
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
agility: P. ἐλαφρότης, ἡ (Plato).
quickness: P. ὀξύτης, ἡ; see quickness.
