ἀείφρουρος
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)
ον,
A ever-watching, i.e. everlasting, τῷ ἀ. μελιλώτῳ Cratin.98.7; οἴκησις ἀ., of the grave, S.Ant.892; πόνοι Opp.H.4.189.