真面目くさる
- 1to become extremely serious (in attitude) ; to look solemn ; to assume a solemn air Translated by Jiyomi
Other writings and readings
真面目腐るマジメ腐るまじめ腐るマジメくさる
Godan verb with 'ru' ending · intransitive verb
JMdict entry 1364370. Source and licence.