insouciant

adj. 漫不经心的; 无忧无虑的

insipidly, insist, insist on sth. (doing sth.), insist upon, insistence, insistent, insistently, insofar, insofar as, insole, insolence, insolent, insolently, insoluble, insolvency, insolvent, insomnia, insomniac, insomuch, insouciance, Insp, inspect, inspection, inspector, inspector of taxes (also tax inspector), inspectorate, inspiration, inspirational, inspire, inspired, inspiring, Inst, instability, instable, install, install (US also instal), installation, installment, instalment, instalment plan,