adj.漠不关心的，冷静的，若无其事的

He took a nonchalant approach to the entire situation, as if it were of no consequence.
他对待整个情况显得漫不经心，仿佛无关紧要。
She walked into the room with a nonchalant smile, not seeming to notice the stares.
她带着漫不经心的微笑走进房间，似乎没注意到众人的注视。
The detective's nonchalant comment caught the murderer off guard.
侦探的不经意话语让凶手措手不及。
He shrugged off her question with a nonchalant shrug, clearly not wanting to engage in a conversation about it.
他对她的问题不以为然地耸耸肩，显然不想深入讨论。
She answered his question with a nonchalant 'I don't know', revealing her lack of interest.
她用漫不经心的“我不知道”回答他的问题，显示了她对此事的不在意。
His nonchalant attitude towards his responsibilities often led to delays and mistakes.
他对职责的漫不经心常常导致延误和错误。
She entered the party wearing a nonchalant, yet elegant dress, turning heads effortlessly.
她穿着随意而优雅的礼服进入派对，轻松吸引人们的目光。
Despite the chaos around him, he remained nonchalant, calmly going about his business.
尽管周围一片混乱，他仍保持冷静，从容地做着自己的事情。
The athlete's nonchalant response to the media inquiries showed his confidence in his performance.
这位运动员对媒体提问的轻松态度显示出他对比赛表现的信心。
The boss's nonchalant nod signaled approval for the proposed project, leaving everyone feeling relieved.
老板漫不经心的点头表示对项目提案的认可，让所有人都松了一口气。