If someone is nonchalant, they look and act as if they are not interested and not worried. A nonchalant person may shrug, speak lightly, or smile a small smile while everyone else is tense.

If someone is nonchalant如果一個人nonchalant they look and act as if they are not interested and not worried看起來和表現得就好像不感興趣也不擔心 A nonchalant person may shrug, speak lightly, or smile a small smile一個nonchalant的人可能會聳聳肩、輕描淡寫地講話，或微微一笑 while everyone else is tense儘管其他人都很緊張

English speakers often use it when the calm feels a bit too cool: “He was nonchalant about the broken window” can carry a tiny complaint — he should have cared more. It is not a rude word, but it is not always praise either.

English speakers often use it when the calm feels a bit too cool當那種冷靜感覺有點太過頭的時候，英語使用者常常會用這個字 "He was nonchalant about the broken window" can carry a tiny complaint『He was nonchalant about the broken window（他對打破的窗戶滿不在乎）』這句話可能帶著一點小小的不滿 — he should have cared more——意思是他應該要更在乎一點 It is not a rude word這不是一個粗魯的字 but it is not always praise either但也不總是稱讚

Teenagers and adults both use it; it is common in stories and in talk about attitude. It is the adjective; the matching noun is nonchalance, and the adverb is nonchalantly.

Teenagers and adults both use it青少年和大人都會用這個字 it is common in stories and in talk about attitude在故事裡和講態度的時候很常見 It is the adjective這是形容詞 the matching noun is nonchalance, and the adverb is nonchalantly對應的名詞是nonchalance，副詞是nonchalantly

The French root sits on “not” plus “to be warm”: not getting warm about the matter.

The French root sits on "not" plus "to be warm":法語字源建立在『不』加上『變熱』之上 not getting warm about the matter也就是對這件事不會激動起來