νηπιότης
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)
ητος, ἡ,
A childhood, infancy, Arist.Pr.896b6. II childishness, Pl.Lg.808e, J.AJ1.19.3, 2.9.7; ν. φρενῶν Luc.Halc. 3.