ἀπηνόφρων
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, gen. ον ος, A harsh-minded, Sch.A.Pr.159.
German (Pape)
[Seite 290] ον, unfreundlich gesinnt, Schol. Aesch. Prom. 159.
Spanish (DGE)
-ον, gen. -ονος
de mente cruel (Prometeo), Sch.A.Pr.159.