- unalterability - the quality of not being alterable
--1 is a kind of immutability, immutableness, fixity
Antonyms: alterability
--1 has particulars: incurability - fixedness, unalterability - the quality of being fixed and unchangeable; "the fixedness of his gaze upset her"
--2 is a kind of changelessness, unchangeability, unchangeableness, unchangingness