真面目くさる まじめくさる Also written マジメくさる, 真面目腐る, マジメ腐る, まじめ腐る Meanings Godan verb, Intransitive 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) Kanji 真 true. Read as ま. 面 face 目 eye Jinuma: Japanese Dictionary · Word lists