What does 肝心 mean?
肝心 is a Japanese noun meaning “essential, fundamental, crucial” in English. It is written as 肝心 in kanji, かんじん in hiragana, and kanjin in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
なんであれ物事の本体を捕らえる事が肝心だ。
No matter what the problem is, it's essential to get at the heart of the matter.