1) Binding 2) Final 3) Hopeless 4) Immovable 5) Inalterable 6) Incommutable 7) Permanent 8) Unchangeable 1) Final 2) Inalterable 3) Incurable 4) Inescapable 5) Inevitable 6) Last 7) Of a sentence 8) Relentless 9) Unavoidable 10) Unchangeable 11) Unstoppable 
[adj] - not capable of being changed or altered 2. [adj] - (law) of a sentence
unalterable, unalterably 1. Incapable of being altered, changed, or modified; inalterable. 2. Impossible to alter; such as, 'the unalterable season of bitter cold in a Siberian winter.'
inalterable adjective not capable of being changed or altered; `unalterable resolve`; `an unalterable ground rule`
not capable of being altered, changed, or modified.
[SAT terms] not capable of being changed