μυθικός
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
English (LSJ)
ή, όν,
A mythic, legendary, μ. τις ὕμνος Pl.Phdr.265c; οἱ μ. χρόνοι D.H.1.2; τὰ μ. books of legends, title of treatise by Neanthes, Ath.13.572e. Adv. -κῶς Arist.Metaph.1000a18, 1074b4, Cael.284a23; opp. ἀληθῶς, Phld. Rh.2.53S.: Comp. -ωτέρως or -ώτερον, Sch.Lyc.18, Tz.H.2.823.