没分暁漢
also: わからずや
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Meanings
1
Refers to a stubborn, unreasonable person who won't listen to reason. The kanji form 没分暁漢 is a rare yojijukugo; in modern Japanese, わからずや is the usual written form.
He's a complete blockhead and won't listen to anyone.
It's impossible to persuade that obstinate person.