丧心病狂

sàngxīn-bìngkuáng

[frenzied; be perverse; as mad as March hare; be seized with crazy ideas; have cracked brains] 丧失理智, 像发了疯一样, 形容言行荒谬或残忍到了极点

日本鬼子没有打伤他, 而他伤在这些丧心病狂的反共顽军的手里了。 --知侠《铁道游击队》