Ancient Greek lemma · Strong’s G4644

σκληροτράχηλος

sklerotrachelos · /sklay-ro-trah'-hay-los/ — “stiff-necked”

Stiff-necked, stubborn; used of those who resist divine instruction or correction. In the LXX, a characteristic epithet for Israel's rebellious disposition.

Derivation: from σκληρός (hard, harsh) and τράχηλος (neck)