a bit mental

• 不理智的；精神错乱的

a bit mental的用法和样例：

例句

1. Three people were killed by a deranged gunman.
   三个人被一名精神错乱的枪手杀死。
2. There was a streak of insanity in the family.
   这个家族有精神错乱的倾向。