高深莫测 profound and unfathomable
Explanation
形容事物深奥难测，难以理解。
Describes something as profound, mysterious and difficult to understand.
Origin Story
西汉时期，涿郡太守严延年以其刚正不阿闻名。一日，他收到举报，称高氏家族横行乡里，欺压百姓。严延年并未轻举妄动，而是暗中调查，收集证据。他的一举一动都显得深思熟虑，让人捉摸不透，高氏家族也因此忐忑不安，不知严延年葫芦里卖的什么药。最终，严延年掌握了确凿证据，一举将高氏家族的罪行公之于众，将其绳之以法，百姓拍手称快。严延年断案如神，其深谋远虑、高深莫测的处事风格，令地方官员和百姓都对他敬畏三分。
During the Western Han Dynasty, Yan Yanyen, the prefect of Zhuojun, was known for his integrity and incorruptibility. One day, he received a report that the Gao family was rampant in the countryside and oppressing the people. Yan Yanyen did not act rashly, but secretly investigated and collected evidence. His every move seemed thoughtful and unfathomable, causing the Gao family to be uneasy and wondering what Yan Yanyen had in mind. In the end, Yan Yanyen obtained conclusive evidence and exposed the crimes of the Gao family to the public, bringing them to justice, much to the delight of the people. Yan Yanyen's judgment was so profound and his actions were so mysterious that local officials and people alike were in awe of him.
Usage
多用于形容计划、策略、想法等难以捉摸，深奥难懂。
Often used to describe plans, strategies and ideas as difficult to understand, profound and mysterious.
Examples
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他的计划高深莫测，让人捉摸不透。
tade jihua gaoshen moce, rang ren zuomobutoutou.
His plan is so profound and unfathomable that it is difficult to understand.
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这位大师的书法高深莫测，令人叹为观止。
zheiwei dashide shushu gaoshen moce, lingrentanwei guanzi.
The calligraphy of this master is so profound and mysterious that it is amazing.