nonnegotiable

adj

1. (not-comparable)Not negotiable; not subject to negotiation.

   “For the hypermaterialistic and chronically adolescent Nancy, what was nonnegotiable was control, the power to sculpture her world to gratify her ever-sharpening appetites and desires.”

2. (not-comparable)Not negotiable; not subject to negotiation.
3. (not-comparable)Not negotiable; not subject to negotiation.

noun

1. Something that is not negotiable.

   “Near-synonym: deal breaker”

   ““It is only once you start looking at houses that you realize what you do and don’t like, and what your negotiables and nonnegotiables are,” Ms. Wexler said.”