ひつようふかけつ 必要不可欠 LinksSentence search for 必要不可欠Sentence search for ひつようふかけつKanji details for 必, 要, 不, 可 and 欠Edit in JMdict Na-adjective (keiyodoshi), Noun which may take the genitive case particle 'no'1. absolutely essential; indispensable; vital; critical Discussions Log in to talk about this word.