κοινωνητέον
From LSJ
ἀμήχανον δὲ παντὸς ἀνδρὸς ἐκμαθεῖν ψυχήν τε καὶ φρόνημα καὶ γνώμην, πρὶν ἂν ἀρχαῖς τε καὶ νόμοισιν ἐντριβὴς φανῇ → hard it is to learn the mind of any mortal or the heart, 'till he be tried in chief authority | it is impossible to know fully any man's character, will, or judgment, until he has been proved by the test of rule and law-giving
English (LSJ)
A one must share in, τινός τινι Pl.R.403b; φιλίας Ph.2.401; ὀνειδῶν Plu.Pomp.44.
Greek (Liddell-Scott)
κοινωνητέον: ῥημ. ἐπίθ., δεῖ κοινωνεῖν, τινός τινι Πλάτ. Πολ. 403Β.
Greek Monotonic
κοινωνητέον: ρημ. επίθ., αυτό που πρέπει να είναι κοινό, σε Πλάτ.