欠かかせない

expression, i-adjective

indispensable; essential; vital; crucial

Used to describe something that cannot be done without; often appears in the pattern ～に欠かせない.

• 水みずは生いき物ものに欠かかせないものだ。

  Water is indispensable for living things.

• このプロジェクトには彼かれの協きょう力りょくが欠かかせない。

  His cooperation is essential for this project.