nonchalance
noun /ˈnɒnʃələns/
/ˌnɑːnʃəˈlɑːns/
[uncountable]- a calm and relaxed way of behaving; behaviour that gives the impression you are not feeling worried
漠不关心：一种冷静和轻松的举止；令人印象深刻的行为，您不会感到担心的 - an air of nonchalance
一副满不在乎的样子
- an air of nonchalance