insouciance
noun [ U ] literary uk/ɪnˈsuː.si.əns/ us/ɪnˈsuː.si.əns/
无忧无虑;满不在乎
a relaxed and happy way of behaving without feeling worried or guilty
I admired his youthful insouciance. 我羡慕他那充满朝气、无忧无虑的样子。
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