nonnegotiable

adjective
non·​ne·​go·​tia·​ble | \ ˌnän-ni-ˈgō-sh(ē-)ə-bəl How to pronounce nonnegotiable (audio) \

Definition of nonnegotiable

: not negotiable especially : not open to discussion or reconsideration a list of nonnegotiable demands a nonnegotiable fee