οὐ γὰρ ἂν τό γε πραχθὲν ἀγένητον θείη → since he cannot make what was done as though it had not come to pass
μηχανοῦργος, -η, -ον (Μ)πανούργος, δόλιος.[ΕΤΥΜΟΛ. < μηχανή + -νοῦργος, κατά τα ραδιούργος, πανούργος].