The politician was unapologetic for plunging the country into debt.
He always was unapologetic about his crime.
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Unapologetic means not feeling or expressing regret or remorse for one's actions, beliefs, or opinions. It is characterized by a lack of apology or justification for one's behavior.
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The antonym for "remorseful" is "unrepentant" or "unapologetic."
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Unapologetic (Out November 19th,2012)
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Yes, remorselessly is an adverb. It means in an unapologetic or
ruthless manner.