不可欠

(1)absolutely essential

(2)必要不可欠な

(3)not to be dispensed with; essential; "foods indispensable to good nutrition"

(4)省かれないように

(5)必須の

(6)absolutely necessary; vitally necessary; "essential tools and materials"; "funds essential to the completion of the project"; "an indispensable worker"

(7)絶対に必要なさま

(8)きわめて必要であるさま

(9)basic and fundamental; "the essential feature"

(10)基本的な

(11)of the greatest importance; "the all-important subject of disarmament"; "crucial information"; "in chess cool nerves are of the essence"

(12)最も大きな重要性の

(1)