ξυνήϊος
From LSJ
Ἀμήχανον δὲ παντὸς ἀνδρὸς ἐκμαθεῖν ψυχήν τε καὶ φρόνημα καὶ γνώμην πρὶν ἂν ἀρχαῖς τε καὶ νόμοισιν ἐντριβὴς φανῇ → It is impossible to know the spirit, thought, and mind of any man before he be versed in sovereignty and the laws
English (LSJ)
η, ον, Ep. and Ion. (ξύνειος is not found),
A common : neut. pl. ξυνήϊα, τά, common stock, Il.1.124, 23.809.
German (Pape)
[Seite 282] ep. u. ion. für ξύνειος, = ξυνός, gemeinsam; οὐδ' ἔτι που ἴδμεν ξυνήϊα κείμενα, Il. 1, 124, gemeinsames Eigenthum, das dem ganzen Heere gehört, noch nicht vertheilt ist, vgl. 23, 809.