Strong's #4643: sklerotes (pronounced sklay-rot'-ace)
from 4642; callousness, i.e. (figuratively) stubbornness:--hardness.
Thayer's Greek Lexicon:
́
sklērotēs
1) hardness
2) obstinacy, stubbornness
Part of Speech: noun feminine
Relation: from G4642
Citing in TDNT: 5:1028, 816
Usage:
This word is used 1 times:
Romans 2:5: "But after thy hardness and impenitent heart treasurest up"