in·sou·ci·ance /ɪnˈsusiən(t)s, ænsusjɑns/
漫不經心;無憂無慮
In·sou·ciance n. Carelessness; heedlessness; thoughtlessness; unconcern.
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insouciance
n : the cheerful feeling you have when nothing is troubling you
[syn: carefreeness, lightheartedness, lightsomeness]