σκληρότηςsklērótēs
GreekG46431 occurrences (KJV)
callousness, i.e. (figuratively) stubbornness
KJV renders it: hardness
Where it appears
- Rom 2:5But according to your hardness and unrepentant heart you are treasuring up for yourself wrath in the day of wrath, revelation, and of the righteous judgment of God;
Lexical data: Strong’s Hebrew & Greek Dictionaries (1890, public domain; openscriptures, CC-BY-SA). Word tagging from the Strong’s-numbered KJV.