ἀνεπίβατος
From LSJ
ἀναγκαιότεραι μὲν οὖν πᾶσαι ταύτης, ἀμείνων δ᾽ οὐδεμία → accordingly, although all other sciences are more necessary than this, none is more excellent (Aristotle, Metaphysics A 983a10)
English (LSJ)
ον,
A not to be climbed, γυμνῷ ποδί Str. 12.3.11; inaccessible, Plu.2.228b.
German (Pape)
[Seite 224] unzugänglich, ἀνεπίβατον ποιεῖν τι, den Zugang zu etwas versperren, Plut. u. D. Sic.