sklerotes denotes a hardened disposition paired with an unrepentant heart and leading to stored-up wrath.

The attested use describes a hardened disposition joined to an unrepentant heart in a clause about storing up wrath.

1. Hardened disposition resisting repentance · dominant

   In Romans 2:5, the accusative singular feminine form occurs in the phrase joined with “unrepentant heart”; the APB renders the clause, “according to your hardness and unrepentant heart you store up to yourself wrath.”

   Romans 2:5

In the Anselm Project Bible: In Romans 2:5, the APB presents the term within “your hardness and unrepentant heart.” This wording confirms the clause's presentation rather than isolating a precise English equivalent.