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Kotomora

真面目まじめくさる

also: マジメくさる

ま
じ
め
く
さ
る

Meanings

1

godan verb (-ru), intransitive verb

put on a serious face; act overly solemn; become dead serious

Often used critically or humorously when someone suddenly adopts an exaggeratedly serious attitude. Frequently appears in the forms 真面目くさった or 真面目くさって.