σκοτεινόν
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
Russian (Dvoretsky)
σκοτεινόν:
I τό тьма: ἀνὰ τὸ σ. Thuc. в темноте.
II adv. досл. в потемках, перен. в безвестности (ζῆν Plat.).