Nonnegotiable

Our fee is nonnegotiable.

These prices are nonnegotiable.

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.

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.