from The Century Dictionary.
- noun Unalterableness.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun the quality of not being alterable
- noun the quality of being fixed and unchangeable
Sorry, no etymologies found.
On the third point: the indissolubility and unalterability of which
He read on her set lips the unalterability of her determination.
Aluminum is used principally in castings and drawn and pressed ware, for purposes in which lightness, malleability, and unalterability under ordinary chemical reagents are desired.
 I insist upon this unalterability of colour the more because I address you as a beginner, or an amateur; a great artist can sometimes get out of a difficulty with credit, or repent without confession.
a much higher idea of change than I had previously entertained; and though, as you know, never very stubborn about unalterability of specific type, I never felt so shaky about species before.