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. 不感興趣; 不關心
She'd mentioned it casually once, surprising him by her unconcern. 她隨意地提過一次這個事，她的漠不關心讓他喫驚。
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