1) Final 2) Incurable 3) Last 4) Unalterable 1) Unalterable 
• (a.) Not alterable; incapable of being altered or changed; unalterable.
In·al'ter·a·ble adjective [ Prefix in- not + alterable : confer French inaltérable .] Not alterable; incapable of being altered or changed; unalterable. -- In*al'ter*a*ble*ness , noun -- In*al'ter*a*bly , adverb 
inalterable, inalterability 1. Not capable of being changed or altered. 2. Impossible to alter; unchangeable.
unalterable.
not capable of being changed or altered