Unconcerned
/ˌʌnkəˈnsɜrnd/
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Definition
(adj) Indifferent and having no interest; aloof.
Sentence Examples
I am unconcerned with the problem.
I can't be unconcerned about your future.
CEFR Practice Quiz
He seemed completely ____ by the news, which surprised many of his colleagues who were very worried about it today.