adjective
having an air of easy unconcern or indifference
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The CEO remained nonchalant during the board meeting, despite the challenging questions.
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She acted all nonchalant when I asked her about the party, like it wasn't a big deal.
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He was so nonchalant about the whole situation, like he didn't even care.
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Her nonchalant attitude towards her studies eventually caught up with her when she failed the exam.