大谬不然 great mistake
Explanation
指完全错误，根本不是那样。
It means completely wrong, not at all like that.
Origin Story
西汉时期，司马迁因替李陵说情而受宫刑，心中悲愤交加，写信给好友任安，诉说自己遭遇的不幸。他写道：“身非木石，独与法吏为伍”，忠心耿耿却受到如此残酷的对待，这真是大谬不然啊！他认为自己为国尽忠，却遭此冤屈，这与他心中所想完全不同，简直是天大的冤枉。这便是“大谬不然”的由来，它深刻反映了司马迁内心的苦闷与无奈，也警示着世人要明辨是非，切勿以偏概全。
During the Western Han Dynasty, Sima Qian was castrated for interceding for Li Ling. Filled with grief and anger, he wrote a letter to his friend Ren An, recounting his misfortune. He wrote, "I am neither wood nor stone, yet I must associate with the law enforcement officers." His unwavering loyalty had led to such cruel treatment – this was indeed a great mistake. He believed he had served the country faithfully, yet was unjustly accused, a great injustice. This is the origin of "dà miù bù rán," reflecting Sima Qian's deep frustration and helplessness, and serving as a warning against hasty judgements.
Usage
常用于书面语，表示完全错误，与事实不符。
Often used in written language, it indicates that something is completely wrong and inconsistent with the facts.
Examples
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他的说法与事实大谬不然。
tade shuofa yu shi shi da miu bu ran
His statement is totally different from the facts.
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你对这件事的理解大谬不然。
ni dui zhe jianshi de li jie da miu bu ran
Your understanding of this matter is completely wrong.