unconcern
柯林斯词典
1. N-UNCOUNT A person's unconcern is their lack of interest in or anxiety about something, often something that most people would be concerned about. 不感兴趣; 不关心
She'd mentioned it casually once, surprising him by her unconcern. 她随意地提过一次这个事，她的漠不关心让他吃惊。
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