Synonyms of impenitent
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incorrigibleIf you tell someone they are incorrigible, you are saying, often in a humorous way, that they have faults which will never change.
• Gamblers are incorrigible optimists.
unrepentantIf you are unrepentant, you are not ashamed of your beliefs or actions.
• She was unrepentant about her strong language and abrasive remarks.
Thesaurus for impenitent from the Collins English Thesaurus