Definition of "unchangeableness"
The quality or state of being unchangeable; immutability.
Quotations
And there are ſome diſpoſitions blame-vvorthy in men, vvhich are yet, in a right ſenſe, holily aſcribed unto God; as unchangeableneſs, and irrepentance: […]
1648, J[oseph] Hall, chapter XLVI, in Select Thoughts: Or, Choice Helps for a Pious Spirit. […], London: […] Nath[aniel] Brooke, […], published 1654, page 140