he took his own life by drinking neat wine."
-- Pausanias, Description of Greece 10.23.12 (2nd century AD)
ἑκουσίως ἀφεῖναι τὴν ψυχὴν ἀκράτου πίνοντα τοῦ οἴνου.
DL10.15 Hermippus relates that [Epicurus] entered a bronze bath of lukewarm water and asked for unmixed wine,
Ἕρμιππος ἐμβάντα αὐτὸν εἰς πύελον χαλκῆν κεκραμένην ὕδατι θερμῷ καὶ αἰτήσαντα ἄκρατον ῥοφῆσαι:...
Just had to check it was the same word. Sure enough. ἄκρατον