noun
a person who is not troubled or worried; someone lacking interest or involvement
adjective
not troubled or worried; lacking interest or involvement
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The CEO remained unconcerned about the minor setback in the company's quarterly profits.
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She seemed completely unconcerned about the upcoming exam, even though she hadn't studied at all.
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He's so chill, always unconcerned about what others think of him.
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The old oak tree stood tall and unconcerned as the storm raged around it.