出处：按学科分类—语言、文字 中国对外翻译出版公司《汉英成语词典》第168页（198字）
为非作歹，违法乱纪，例他平日道貌岸然，想不到竟也作奸犯科，真是出人意料。
He was such a prim and proper personwho would ever have thought he would commit crimes in violation of the law!