Jisho

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まじめ 真面目くさる
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Godan verb with 'ru' ending, Intransitive verb
1. to become extremely serious (in attitude); to look solemn; to assume a solemn air​usu. as 真面目くさった or 真面目くさって
Other forms
真面目腐る 【まじめくさる】、まじめ腐る 【まじめくさる】、マジメ腐る 【マジメくさる】

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