真剣しんけん
shinken

na-Adjective

1. serious; earnest

ジョージは勉強べんきょう真剣しんけんでない。
jōjiwa benkyōni shinkendenai.
George is not serious about his study.
Noun

2. real sword (as opposed to a wooden practice weapon)

「親父おやじこれって・・・真剣しんけん?」「当たりまえだろう、決闘けっとうなのだからな」
"oyajikorette...shinken'" "atarimaedarō kettōna nodakarana"
"Dad, this a real sword?" "Of course, it is a duel after all."