ἀνέξοιστος
From LSJ
ὅτι μέντοι καὶ ἡ χρῆσις τῶν τρόπων, ὥσπερ τἆλλα πάντα καλὰ ἐν λόγοις, προαγωγὸν ἀεὶ πρὸς τὸ ἄμετρον, δῆλον ἤδη, κἂν ἐγὼ μὴ λέγω → however, it is also obvious, even without my saying so, that the use of figures of speech, like other literary adornments, is something that has always tempted toward excess
English (LSJ)
ον,
A not to be expressed, ineffable, ib.728d, Gorg.(?)ap.S.E.M.7.82, Jul.Or.5.158d.
German (Pape)
[Seite 224] nicht herauszubringen, Plut. Symp. 8, 8.