Jisho

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なお 馬鹿ななきゃらない
Expressions (phrases, clauses, etc.), I-adjective (keiyoushi)
1. once a fool, always a fool; idiots will only be cured when they dieProverb
Other forms
バカは死ななきゃ治らない 【バカはしななきゃなおらない】

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