unwaivable
/ˌʌnweɪˈɪvəbəl/Definitions
1. adjective
Impossible to waive or forgive, especially a right or privilege.
“The lawyer argued that the client’s unwaivable right to a fair trial was being denied.”
2. noun
A right or privilege that cannot be waived or forgiven.
“The unwaivable condition in the contract led to a lengthy dispute between the parties.”