non-negotiable
adjective
(also nonnegotiable) uk/ˌnɒnnəˈɡəʊʃəbl̩/ us FINANCE, STOCK MARKET
used to describe a financial product that cannot be traded:
Time deposits are non-negotiable deposits that are maintained in a bank for a specified period of time.
used to describe something that someone refuses to discuss or change:
Talks failed because there were too many non-negotiable issues on both sides.
The buyout offers are nonnegotiable.