If you describe someone as nonchalant, you mean that they appear not to worry or care about things and that they seem very calm.
例句
Clark's mother is nonchalant about her role in her son's latest work...克拉克的母亲对自己在儿子最新作品中的角色漠不关心。Denis tried to look nonchalant and uninterested...丹尼斯竭力表现出漠不关心、不感兴趣的样子。
英汉词典释义
n.
漠不关心,无动于衷,冷淡
declining the offer with cool nonchalance冷淡地拒绝这一提议He conceals his worries behind a mask of nonchalance.他装作若无其事,借以掩饰内心的不安。She shrugged, feigning nonchalance.她耸耸肩，装出一副无所谓的样子。
英英词典释义
Noun
1. the trait of remaining calm and seeming not to care; a casual lack of concern