1: σκληροκαρδία
(Strong's #4641 — Noun Feminine — sklerokardia — sklay-rok-ar-dee'-ah )

"hardness of heart" (skleros, "hard," and kardia), is used in Matthew 19:8; Mark 10:5; 16:14 . In the Sept., Deuteronomy 10:16; Jeremiah 4:4 .