他能够亲眼看到开车冒失的危害.He could see for himself the results of careless driving.你为什么要忍受那个冒失的家伙 呢 ?Why will you tolerate that impudent fellow?只有天真才会做出这种冒失的事.Only innocence dares to be so bold....

“冒失的”的英语可以翻译为：ash，abrupt，boldfaced，fresh，bold-faced ...