ἀρετόομαι
From LSJ
Τὸ νικᾶν αὐτὸν αὑτὸν πασῶν νικῶν πρώτη τε καὶ ἀρίστη. Τὸ δὲ ἡττᾶσθαι αὐτὸν ὑφ' ἑαυτοῦ πάντων αἴσχιστόν τε ἅμα καὶ κάκιστον. → Τo conquer yourself is the first and best victory of all, while to be conquered by yourself is of all the most shameful as well as evil
English (LSJ)
[ᾰ], Pass.,
A become excellent, grow in goodness, Simp. in Epict.p.10D., Id.in Ph.1066.5.
German (Pape)
[Seite 349] gedeihen, Ggstz von κακύνομαι, Simplic. ad Epict.
Greek (Liddell-Scott)
ἀρετόομαι: παθ., γίνομαι ἐνάρετος, προκόπτω ἐν τῇ ἀρετῇ, κατ’ ἀντίθεσιν πρὸς τὸ κακύνομαι, ἡ ψυχὴ τοῖς μὲν χείροσιν ὀρέξεων εἴδεσι κακυνομένη, τοῖς δὲ κρείττοσιν ἀρετουμένη Σιμπλίκ. εἰς Ἐπίκτ. σ. 37. 2.