ἄθεστος
From LSJ
ἔστιν δέ που ἡ μὲν ἐπὶ σώμασι γυμναστική, ἡ δ' ἐπὶ ψυχῇ μουσική → I think I am right in saying that we have physical exercise for the body and the arts for the soul
English (LSJ)
ον, (θέσσασθαι) A not to be entreated, inexorable, of the Erinyes, Hsch.
Greek (Liddell-Scott)
ἄθεστος: -ον, (θέσσασθαι) ὁ μὴ ἐπιδεχόμενος παράκλησιν, ἄκαμπτος, περὶ τῶν Ἐρινύων, πρβλ. Meineke Ἑλλ. Κωμ. 3. 6. 8.
Spanish (DGE)
-ον
inexorable Ἐρινύς SHell.1066 (pero cj. en ap. crít. ἀ<πό>θεστος).