Σίφνιος
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
French (Bailly abrégé)
α, ον :
de Siphnos.
Étymologie: Σίφνος.
Middle Liddell
Σίφνιος, η, ον
Siphnian, Hdt.