Irreplaceable

To me, she's irreplaceable.

The time we've spent together is irreplaceable.

I'm irreplaceable.

Tom is irreplaceable.

You're irreplaceable.

This stuff's irreplaceable.

The cemetery is full of irreplaceable people.

It's unique and irreplaceable.

These are irreplaceable.

Tom isn't irreplaceable.

irreplaceable batteries

irreplaceable family portrait

irreplaceable team member

For some purposes lead is unique and, apparently, irreplaceable. Battery plates may be an example of this.

But whether or not the VCR makes a complete comeback, VHS enthusiasts agree that these tapes occupy an irreplaceable place in culture.