Unapologetic (adjective)

Not expressing remorse or regret; not apologizing.

Origin:

From the word apology meaning "an expression of regret" and the prefix un- meaning "not".

Examples:

1. The company was unapologetic about the data breach.
2. He was unapologetic about his actions and refused to apologize.
3. The politician was unapologetic about the controversial statements.
4. She was unapologetic about her beliefs and stood by them.
5. The band was unapologetic about their loud and energetic performance.