ἀμεταμέλητος
From LSJ
τὸ ἓν καὶ τὸ ὂν πολλαχῶς λέγεται → the term being and the term one are used in many ways, one and being have various meanings, one and being have many senses
English (LSJ)
ον,
A not to be repented of or regretted, ἡδονή Pl.Ti. 59d; τὸ πεπραγμένον αὐτοῖς ἀ. γίγνεται Id.Lg.866e; ἀμεταμέλητον ἐστί τί τινι one has nothing to repent of, Plb.21.11.11. 2 having no opportunity of repentance, Just.Nov.129.3. II of persons, unrepentant, feeling no remorse, ἀ. ἀνίατος Arist.EN1150a22, 1166a29. Adv. -τως Them.Or.19.231a, Inscr.Prien.114.
German (Pape)
[Seite 122] keine Reue verursachend, ἡδονή Plat. Tim. 59 d, öfter; πίστις αὐτοῖς ἀμ. ἔσται, sie werden ihre Treue nicht bereuen, Pol. 24, 11; Cic. Att. 7, 3. 13, 52; nicht bereuend, N. T. – Adv. -τως. Themist.