βαρύφρων
From LSJ
Νέοις τὸ σιγᾶν κρεῖττόν ἐστιν τοῦ λαλεῖν → Sermone melius est iuveni silentium → Es schweigen besser, statt zu schwätzen, junge Leut'
English (LSJ)
ον, gen. ονος, (φρήν)
A heavy of mind, melancholy, gloomy, συντυχίαι Lyr.Adesp.140.8; Αἰήτης A.R.4.731; savage, ταῦρος Lyc.464; cruel, δαίμων Opp.H.4.174. 2 weighty of purpose, grave-minded, Theoc.25.110.