insouciance
🇺🇸
/ɪnˈsuːsiəns/
🇬🇧
/ɪnˈsuːsiəns/
a casual lack of concern or worry
Despite the looming deadline, she displayed an insouciance that surprised her colleagues.
尽管截止日期迫在眉睫,她表现出的无忧无虑让她的同事们感到惊讶。