Unrepayable

A debt so large that it can never be fully repaid.

My unrepayable debt was paid by Christ when He died on the cross for my sin.

by Saweeeeeeeeet! July 22, 2011

Unseparable

Essentially meaning "inseparable" but has a much higher degree of non-seperation, or togetherness.

"Those two are always together, even in the bathroom!"
"Yeah, they're basically unseparable!"

by Best.People.Ever. February 28, 2011