maniac

疯子，躁狂者英释中释nsomeone who behaves in a stupid or dangerous way

发狂的；狂热的；癫狂的英释中释adjIf you describe someone's behaviour as maniac, you are emphasizing that it is extremely foolish and uncontrolled

1 He drove like a maniac to the hospital..他像个疯子似的开车去医院。

2 Suddenly this maniac ran out into the middle of the road..突然这个疯子跑到路当中。

3 He could not maintain his maniac speed for much longer..他不能太长时间地保持这种疯狂的速度。