blithely

He blithely ignored the warning signs and drove straight into the floodwaters.

(Chinese) 他漫不经心地忽略了警告标志，直接开车冲进了洪水里。

The government continued to spend money blithely despite the growing national debt.

(Chinese) 尽管国债在增加，政府仍继续漫不经心地挥霍资金。