insuperable
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 > Greek (Woodhouse)
adj.
P. and V. ἄπορος, ἀμήχανος (rare P.). Unconquerable: P. and V. δύσμαχος (Plat.), ἀνίκητος, V. δυσπάλαιστος, Ar. and P. ἄμαχος (Plat.); see unconquerable.
Spanish > Greek
ἀνυπέρβατος, ἀνυπέρβλητος, ἄπορος, δυσκαταπάλαιστος, ἀνυπέρεκτος, ἀνεπίθετος, ἀπαρεγχείρητος, ἄφθαστος