noun
nonchalant; unconcerned; casual
Describes a person or attitude that is cool, indifferent, or seemingly unbothered. Often used in casual conversation about someone's demeanor.
彼はいつもノンチャランで、何があっても動じない。
He's always nonchalant and never fazed by anything.
そんなノンチャランな態度じゃ、大事なことを見落とすよ。
With such a nonchalant attitude, you'll overlook important things.