δυσκολοπαίπαλος

From LSJ

οὐ γὰρ ἂν τό γε πραχθὲν ἀγένητον θείη → since he cannot make what was done as though it had not come to pass

Source

Russian (Dvoretsky)

δυσκολοπαίπαλος: v. l. = δυσοδοπαίπαλος.