v prove to be of unsound mind or demonstrate someone's incompetence v cause to appear foolish v deprive of strength or efficiency
prove to be of unsound mind or demonstrate someone's incompetence v
of unsound mind
精神失常（无须对自己的行为负责）; 精神失常, 头脑不健全
person of unsound mind
[法] 精神病者, 精神失常者, 疯子
