かん
肝
じん
心

adjectival noun or quasi-adjective, takes genitive case の, noun

  1. essential, important, crucial, vital, main.

Variations

Pronunciation Kanji Kana Is Common
かん
肝
じん
心
 肝心 かんじん ✔
かん
肝
じん
腎
 肝腎 かんじん

Contained Kanji Breakdown

liver, pluck, nerve
カン　きも (Late Jr. High, N1)
month, moon
つき　ゲツ　ガツ (1st, N5)
dry, parch, ebb
ひ.る　カン　ほ.す (6th, N2)
heart, mind, spirit
こころ　シン (2nd, N4)