οὐ γὰρ ἂν τό γε πραχθὲν ἀγένητον θείη → since he cannot make what was done as though it had not come to pass
-ον, Ατετράσχιστος.[ΕΤΥΜΟΛ. < τετρ(α)- + -χηλος (< χηλή «οπλή», πρβλ. δίχηλος].