G0278–ἀμεταμέλητος–ametamelētos

For God does not repent of His free gifts nor of His call;

ἀμεταμέλητα ametamelēta “Irrevocable”

For godly sorrow produces repentance leading to salvation, a repentance not to be regretted; but the sorrow of the world finally produces death.

ἀμεταμέλητον ametamelēton “without regret”