in an unconcerned, indifferent, or unexcited manner; casually: The bear was nonchalantly ambling along in the grass, heading straight towards me.

What does nonchalantly mean mean?

: in a nonchalant manner : in a casual way that shows a relaxed lack of concern or interest She nonchalantly glanced our way.

What does nonchalance mean in slang?

the state or quality of being nonchalant; cool indifference or lack of concern; casualness.