丧心病狂 insane
Explanation
丧失理智，像发了疯一样。形容言行荒谬，或残忍可恶到了极点。
To lose one's mind; to be like a madman. Describes behavior that is absurd or cruel and hateful to the extreme.
Origin Story
话说南宋时期，奸臣秦桧为了讨好金国，不惜残害抗金英雄岳飞，这行为让许多正直之士义愤填膺。朝中一位名叫范如圭的官员，目睹秦桧的种种恶行，实在无法忍受，痛斥秦桧：‘公不丧心病狂，奈何为此？必遗臭万世矣！’。这句话的意思是：你难道不是丧心病狂了吗？为什么要这样做？你一定会遗臭万年的！秦桧的所作所为，确实令人发指，也应验了范如圭的预言，最终成为千古罪人，被钉在历史的耻辱柱上。秦桧的故事，至今仍警示着后人：做人要正直，不能为了私利而丧失良知，做出丧心病狂的事情。
During the Southern Song Dynasty, the treacherous minister Qin Hui, in order to appease the Jin Dynasty, did not hesitate to harm the anti-Jin hero Yue Fei. This behavior filled many upright officials with indignation. An official named Fan Ruigui, witnessing Qin Hui's various evil deeds, could no longer bear it and rebuked Qin Hui: 'Are you not mad? Why do you do this? You will surely be infamous for all ages!' Qin Hui's actions were truly appalling, and Fan Ruigui's prophecy came true. Qin Hui eventually became a notorious traitor, forever condemned by history. Qin Hui's story serves as a warning to future generations: Be upright, and do not lose your conscience for personal gain. Do not do things that are outrageous and evil.
Usage
形容人失去理智，行为疯狂；也指行为残忍恶劣到了极点。
Describes someone who has lost their mind and behaves madly; also describes behavior that is cruel and vicious to the extreme.
Examples
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他这种行为简直丧心病狂！
ta zhe zhong xingwei jianzhi sangxinbingkuang
His behavior was simply insane!
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战争年代，敌人的暴行令人丧心病狂。
zhanzheng niandai, di ren de baoxing ling ren sangxinbingkuang
During wartime, the atrocities of the enemy were appalling.