ἀπείρατος
From LSJ
καὶ τὸ σιγᾶν πολλάκις ἐστὶ σοφώτατον ἀνθρώπῳ νοῆσαι → and silence is often the wisest thing for a man to heed, and often is man's best wisdom to be silent, and often keeping silent is the wisest thing for a man to heed
English (LSJ)
ον, Dor. and Att. for ἀπείρητος.
ἀπείρᾰτος, ον, (-ṇ-τος, cf. πειραίνω)
A impenetrable, Pi.O.6.54. II ἄπειρος (B), v.l. in Hp.Flat.3, dub. in Dam.Pr.107.