non-negotiable

US /ˌnɑːn.nəˈɡoʊ.ʃi.ə/
UK /ˌnɑːn.nəˈɡoʊ.ʃi.ə/
1.

不容商榷

Something that is non-negotiable cannot be changed by discussion:

:
•
The terms of this agreement are non-negotiable.
:
negotiationnegotiatenegotiablethe negotiating tablenon-fictionnon-alcoholicnon-renewable