ἔπακμος
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, (ἀκμή)
A in the bloom of age, κόραι D.H.4.28 (v.l.). II pointed, ἄκανθα Dsc.1.90; ὀδούς Plu.2.966c; sharp-edged, Sor.1.80; σμιλίον Gal. ap. Orib.inc.12.1.