nonchalant
🇺🇸
/ˌnɑːnʃəˈlɑːnt/
🇬🇧
/ˈnɒnʃələnt/
adjective
R
acting in a relaxed and calm way, showing that you do not care or are not worried about anything
He gave a nonchalant wave and walked away.
彼は何気ない手振りで去っていった。
translation
無関心な