неуступчивый

From LSJ

εἰ μὲν θάνατόν τε φυγὼν καὶ γῆρας ἀπεχθόμενον ἔστι τοι τούτων λάχος → if you wish to escape death and hated old age you can have this lot

Source

Russian > Greek

ἀμήχανος, ἀπαραχώρητος