ἀδιά-φθορος · adia-phthoros — LSJ
not affected by decay, Antyll. ap. Orib. 46.22.3; uncorrupted, chaste, Pl. Phdr. 252d; απʼ ὀρθῆς. . καὶ ἀδιαφθόρου τῆς ψυχῆς D. 18.298, cf. Men. 984, D.S. 1.59, Plu. Lib.educ. 2.5e. Adv. -ρως, ἐρᾶσθαι Aeschin. 1.137.
of judges, incorruptible, Pl. Lg. 768b; of witnesses, Arist. Rh. 1376a17; of magistrates, Id. Pol. 1286a39 (Comp.), cf. IG 2.240b13. Sup. Adv. -ώτατα Pl. l.c.
imperishable, Pl. Phd. 106e.