εὔπορον

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

Source

Russian (Dvoretsky)

εὔπορον: τό
1 обилие: διὰ τὸ εὔ. τῆς ἐλπίδος Thuc. в большой надежде, крепко надеясь;
2 имущие классы (τὸ εὔ. καὶ ἱερεῖς Arst.).