πεφυλαγμένως
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)
Adv., (φυλάσσω)
A with due caution, X.An.2.4.24, Eq.Mag.6.2, Aen.Tact.15.7, D.7.29, Plu.Oth.7,al., Luc.Philops.6; πρός τι π. ἔχειν Isoc.8.97.