indoblegable
From LSJ
Θεοὶ μὲν γὰρ μελλόντων, ἄνθρωποι δὲ γιγνομένων, σοφοὶ δὲ προσιόντων αἰσθάνονται → Because gods perceive future things, men what is happening now, but wise men perceive approaching things
Spanish > Greek
δυσνίκητος, ἀδάμαστος, ἀδυσώπητος, ἀκατακλινής, ἀλίαστος, ἄγναμπτος, ἄθελκτος, ἄρρηκτος