unrepentent
Unrepentant is an adjective describing a person or attitude that refuses to feel remorse or to apologize for one’s actions, or who maintains a belief or course of action in the face of criticism or consequences. The term is commonly used in moral, legal, religious, and political contexts to denote a persistent lack of contrition rather than mere error.
Etymology and spelling note: the standard form is unrepentant, from un- (not) + repentant (feeling or expressing
Usage and nuance: in religious discourse, an unrepentant sinner is someone who does not repent despite admonition.
See also: remorseless, unapologetic, obstinate, dogmatic, penitent, contrite.