跟他讲道理是对牛弹琴。
Reasoning with him is like casting pearls before swine.
对牛弹琴
lit. to play the lute to a cow (idiom); fig. offering a treat to an unappreciative audience; to cast pearls before swine
HSK 3.0 · Band 7 trad. 對牛彈琴
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对
牛
弹
琴
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对
弹
See it in sentences
别对牛弹琴了。
Don't waste your words on him.