βροντητικός
From LSJ
ἔνδον σκάπτε, ἔνδον ἡ πηγή τοῦ ἀγαθοῦ καί ἀεί ἀναβλύειν δυναμένη, ἐάν ἀεί σκάπτῃς → Dig within. Within is the wellspring of Good; and it is always ready to bubble up, if you just dig. | Look within. Within is the fountain of the good, and it will ever bubble up, if thou wilt ever dig.
English (LSJ)
thundering, epithet of Ζεύς, Eust. 141.27.
Spanish (DGE)
-ή, -όν tonante epít. de Zeus, Eust.141.27.
German (Pape)
[Seite 464] donnernd, Eust.