无疾而终 die a natural death
Explanation
指人或事没有遭受外力影响或意外变故，自然而然地结束或消亡。多用于指死亡，也可用于指计划、项目等。
Refers to a person or thing that ends or perishes naturally without external influence or unexpected events. Often used to refer to death, it can also be used to refer to plans, projects, etc..
Origin Story
从前，在一个偏僻的山村里，住着一位德高望重的老人。他一生勤劳善良，乐善好施，深受乡邻们的爱戴。然而，在他七十寿辰那天，老人却安详地离开了人世。没有疾病的折磨，没有意外的发生，老人就这样平静地走完了他的一生，无疾而终。人们怀念着这位老人，纷纷前来送别。老人平静的离去，如同秋叶归根，自然而然，令人感慨万千。他的故事也成为了村里流传已久的佳话，教育着后人要珍惜生命，孝敬父母。
Once upon a time, in a remote mountain village, there lived a respected old man. He was diligent and kind all his life, and loved to do good deeds, being deeply loved by his neighbors. However, on his seventieth birthday, the old man peacefully passed away. Without the torment of illness, without any accidents, the old man quietly ended his life. People remembered this old man and came to see him off. The old man's peaceful departure, like autumn leaves returning to their roots, was natural and touching. His story became a long-standing legend in the village, teaching later generations to cherish life and respect their parents.
Usage
通常作谓语，形容事物自然结束，没有外力干扰。
It is usually used as a predicate to describe how something ends naturally without external interference.
Examples
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他年事已高，最终无疾而终。
ta nian shi yi gao, zui zhong wu ji er zhong
He was already old and finally died peacefully.
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这个项目因为缺乏资金支持，最终无疾而终了。
zhe ge xiang mu yinwei que fa zi jin zhi chi, zui zhong wu ji er zhong le
The project eventually came to nothing due to lack of financial support..