- I〔本当の剣〕a real sword
- II〔本気で取り組む様子〕真剣な serious
真剣に 〔本気で〕seriously;〔熱心に〕in earnest, earnestly
- 人生について真剣に考える
- think seriously [earnestly] about life
- 私は真剣です
- I am serious [in earnest/《口》 in dead earnest]./I mean 「what I say [《口》 business].
- いつも真剣さが足りない
- He never takes things seriously enough.
- 真剣勝負〔真剣を使っての勝負〕a fight with real swords;〔本気で争うこと〕a game played in real earnest