Synonyms:
- callous,
- hard,
- hardened,
- impenitent,
- insolent,
- obdurate,
- recidivist,
- recidivistic,
- recidivous,
- regretless,
- remorseless,
- unabject,
- unashamed,
- uncontrite,
- unembarrassed,
- unmelted,
- unregenerate,
- unregretful,
- unremorseful,
- unrepenting,
- unsoftened,
- unsorry,
- untouched