incommutable

adjective

Not able to be exchanged one for another.

adjective

That cannot be altered.

Not commutable; incapable of being commuted or exchanged with another.

adjective

Not commutable; not capable of being exchanged with, or substituted for, another.

adjective

Not commutable

adjective

not interchangeable or able to substitute one for another

adjective

not subject to alteration or change