Indispensable was created on 2010-09-21.

Evidence is indispensable to solve the crime scene.

Baptism is not indispensable to salvation, but the two go hand in hand.

As they say, no one is indispensable. By working hard and contributing well to a workplace or other venture, you can make yourself quite important to it, but never indispensable in reality.

The adjective indispensable doesn't have a verb form, only a noun forms indispensable and indispensability, and adverb form indispensably. The closest verb form is 'can't be dispensed with'.