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adjectival nouns or quasi-adjectives (keiyodoshi)
serious, earnest
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ジョージは勉強に真剣でない。
George is not serious about his study.
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noun (common) (futsuumeishi)
real sword (as opposed to a wooden practice weapon)
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「親父これって・・・真剣?」「当たり前だろう、決闘なのだからな」
"Dad, this a real sword?" "Of course, it is a duel after all."
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