FROM STRONG’S GREEK DICTIONARY (1890)

Strong’s Greek Dictionary (1890) — public domain, printed whole.

sklerokardia σκληροκαρδία — sklay-rok-ar-dee'-ah — feminine of a compound of 4642 and 2588; hard-heartedness, i.e. (specially), destitution of (spiritual) perception:--hardness of heart.

see GREEK for 4642

see GREEK for 2588