σκληρογνώμων
From LSJ
ἀλλήλων τὰ βάρη βαστάζετε, καὶ οὕτως ἀναπληρώσετε τὸν νόμον τοῦ Χριστοῦ → bear each other's burdens, and in that way fulfill the anointed King's Law (Galatians 6:2)
English (LSJ)
ον, gen. ονος,
A hard-hearted, Sch.Hes.Op. 146 (Moschop.).
German (Pape)
[Seite 900] hartes, starres Sinnes, Moschop.