ἀμετάκλαστος
From LSJ
Τὰς γὰρ ἡδονὰς ὅταν προδῶσιν ἄνδρες, οὐ τίθημ' ἐγὼ ζῆν τοῦτον, ἀλλ' ἔμψυχον ἡγοῦμαι νεκρόν → But when people lose their pleasures, I do not consider this life – rather, it is just a corpse with a soul
English (LSJ)
ον,
A not to be broken, inflexible, τὸ ἀ. τῆς γνώμης X.Ep.1.2.
German (Pape)
[Seite 122] unbeugsam, τὸ τῆς γνώμης ἀμ., Beharrlichkeit in der Gesinnung, Xen. En. 1. 2.