ἑδράστερος

From LSJ

νέῳ δὲ σιγᾶν μᾶλλον ἢ λαλεῖν πρέπει → it's fitting for a young man to keep silence rather than to speak (Menander)

Source

Spanish (DGE)

-ον
seguro, firme de Esopo ἑ. καὶ συνετός Vit.Aesop.G.79 (ap. crít.).