unrepentant
adjective /ˌʌnrɪˈpentənt/
  /ˌʌnrɪˈpentənt/
- showing no shame about your actions or beliefs不思悔改的;不悔悟的;顽固不化的 - She was cheerfully unrepentant about her part in the deception.她兴高采烈地对自己在骗局中的角色毫不后悔。 
 
- She was cheerfully unrepentant about her part in the deception.