ἀνόστητος
From LSJ
ψυχῆς πείρατα ἰὼν οὐκ ἂν ἐξεύροιο πᾶσαν ἐπιπορευόμενος ὁδόν· οὕτω βαθὺν λόγον ἔχει → one would never discover the limits of soul, should one traverse every road—so deep a measure does it possess
English (LSJ)
ον,
A unreturning, Orph.A.1269. II whence none return, χῶρος ἐνέρων AP7.467 (Antip. Sid.), cf. Opp.H.3.586, etc.