ἀκουστής
From LSJ
ἢ δεῖ σιωπᾶν ἢ λέγειν τὰ καίρια → you should either keep silence or make timely remarks (Menander)
English (LSJ)
οῦ, ὁ,
A hearer, listener, Men.988; τῶν ἀλλοτρίων κακῶν D.H.Dem. 45. 2 auditor, disciple, Scymn.20, Agathem.1.1, Phld.Rh.1.95 S., D.H.Isoc.1, etc.
German (Pape)
[Seite 78] ὁ, Zuhörer, Men. bei Poll. 2, 82, der das Wort tadelt, D. Hal. u. Sp.