συνέντασις
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)
εως, ἡ,
A a putting on the stretch, Chrysipp.Stoic. 2.233, Plu.2.589a. Placit.4.15.3, Antyll. ap. Orib.6.27.11, Gal.6.171.