adjective. Impossible to alter; unchangeable.

Unalterable.

adjective. Not alterable; incapable of being altered or changed; unalterable.

adjective. That cannot be altered.

adjective. not capable of being changed or altered

"In the American system, however, it is expect that Congressmen are to vote at least partially on their own volition; the expectation of individual accountability lends itself to external persuasion, as the vote of the individual is not considered to be inalterable from the party position."

alterable  

final  incurable  last  

inalterability  inalterableness  inalterably  

5mb  apodictic  approximative  creaturely  crowfoot  

assiduous  constant  continuing  diligent  dogged