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adjectival nouns or quasi-adjectives (keiyodoshi), nouns which may take the genitive case particle 'no', noun (common) (futsuumeishi)
essential, important, crucial, vital, main
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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.
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