σκληρογνώμων
From LSJ
Παρθένε, ἐν ἀκροπόλει Τελεσῖνος ἄγαλμ' ἀνέθηκεν, Κήττιος, ᾧ χαίρουσα, διδοίης ἄλλο ἀναθεῖναι → O Virgin goddess, Telesinos from the deme of Kettos has set up a statue on the Acropolis. If you are pleased with it, please grant that he set up another
English (LSJ)
ον, gen. ονος,
A hard-hearted, Sch.Hes.Op. 146 (Moschop.).
German (Pape)
[Seite 900] hartes, starres Sinnes, Moschop.