Synonyms: unalterability, fixedness
Definition: the quality of being fixed and unchangeable
Usage: the fixedness of his gaze upset her
Similar words: unchangeability, unchangeableness, unchangingness, changelessness
Definition: the quality of being unchangeable; having a marked tendency to remain unchanged
Synonyms: unalterability
Definition: the quality of not being alterable
Similar words: immutability, immutableness, fixity
Definition: the quality of being incapable of mutation
Usage: Darwin challenged the fixity of species