μόγος
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
English (LSJ)
ὁ,
A toil, ἱδρῶ θ', ὃν ἵδρωσα μόγῳ Il.4.27; ἀέθλους ἐξανύσαντα μόγῳ IG3.900; μόγῳ πολλῷ κάμηλον ἐξειλκύσαμεν Alciphr.1.17. 2 trouble, distress, S.OC1744 (lyr.). (Cf. Lith. smagùs 'heavy': the initial s is preserved in σμογερός, σμυγερός.)