言不尽意 Words cannot fully express the meaning
Explanation
言语难以完全表达出丰富的情感和深邃的意蕴。常用于书信结尾，表示歉意，由于语言表达能力有限，无法将所有想法都表达出来。
Language cannot fully express the richness of emotion and profound meaning. Often used at the end of a letter to apologize for the inability to express all thoughts due to limitations in language expression.
Origin Story
一位饱经沧桑的老将军，写信给远方的亲人，诉说着征战一生的辛酸与不易。他笔下记录了无数的战火硝烟，也描绘了无数的兄弟情谊。可他明白，再华丽的辞藻也无法完全表达他心中那份对故土的思念，对亲人的牵挂，以及对战友的缅怀。信的结尾，他写下了四个字：“言不尽意”。这四个字，胜过千言万语，它承载了老将军无法言说的深情厚谊。
An old general, who had experienced many battles, wrote a letter to his distant relatives, recounting the hardships and difficulties of his life as a soldier. His words depicted countless battles and the deep camaraderie among the soldiers. But he knew that even the most beautiful words could not fully express the deep longing for his homeland, the love for his family, and the remembrance of his fallen comrades. At the end of his letter, he wrote four characters: "言不尽意". These four characters said more than a thousand words; they carried the unspoken deep feelings of the general.
Usage
多用于书信结尾，表示由于语言表达能力的限制，表达出的内容不足以完全表达内心的想法和情感。
Mostly used at the end of letters to indicate that the content expressed is not enough to fully express one's inner thoughts and feelings due to limitations in language expression ability.
Examples
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他的话语虽然不多，但是却言简意赅，恰恰表达了他的全部意思，这可真是言简意赅啊！
ta de huayu suiran buduo danshi que yanjianyigai qiacquo biaodale ta de quanbu yisi zhe ke zhen shi yanjianyigai a
His words were few, but they conveyed exactly what he wanted to say. That's really concise!
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这封信言不尽意，很多想法都没有表达出来。
zhefeng xin yanbujinyi henduo xiangfa dou meiyou biaodale chulai
This letter doesn't express everything he might feel.