ἥσυχον
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
Russian (Dvoretsky)
ἥσῠχον: I τό спокойствие, кротость Thuc.: ἐν ἡσύχῳ Soph. спокойно.
дор. - ἅσυχον adv. спокойно (Theocr. - v. l. ἁσυχᾷ).