無(な)くてはならないcannot do without something, indispensable, absolutely necessary

Common

1. Expression, い-adjective

   1. 1.

      cannot do without something, indispensable, absolutely necessary

      Usually written using kana alone,

      See Also:

      • 無い

   2. 2.

      have to do

      Usually written using kana alone, after negative base of verb,

      See Also:

      • なければならない