- Original: σκληρότης - Transliteration: Sklerotes - Phonetic: sklay-rot'-ace - Definition: 1. hardness 2. obstinacy, stubbornness - Origin: from G4642 - TDNT entry: 22:08,8 - Part(s) of speech: Noun Feminine - Strong's: From G4642 ; callousness that is (figuratively) stubbornness: - hardness. Total KJV Occurrences: 1 • hardness, 1 Romans 2:5