Obduracy, n.
The duality or state of being obdurate; invincible hardness of heart; obstinacy. "Obduracy and persistency." Shak. The absolute completion of sin in final obduracy. South.
Shades of meaning
Fernald lists obduracy only as an antonym, under repentance.
He lists it without comment; the entries above explain its neighbors.
Synonyms
none given