in·sou·ci·ance /ɪnˈsuːsiəns/ noun [uncountableU] formal HAPPYa cheerful feeling of not caring or worrying about anything 无忧无虑 SYN nonchalance an air of insouciance 无忧无虑的神态
—insouciant adjectiveadj
—insouciantly adverbadv
insouciance• For all her apparent insouciance, she was desperately unhappy.