noun
a state of being calm, casual, and unconcerned
adjective
showing a lack of concern or indifference
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Her nonchalance in the face of adversity was both impressive and concerning.
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I envy her ability to handle difficult situations with such nonchalance.
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He strutted into the room with a level of nonchalance that made everyone turn heads.
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The artist painted with such nonchalance that it seemed as if the brush moved on its own.