idiot

He felt like an idiot after locking his keys inside the car for the third time this month.

(Chinese) 这个月第三次把钥匙锁在车里后，他觉得自己像个笨蛋。

Don't be such an idiot by driving so fast on these icy roads.

(Chinese) 别在结冰的路上开这么快，别犯傻了。