Synonyms: unchangeability, unchangeableness, unchangingness, changelessness
Definition: the quality of being unchangeable; having a marked tendency to remain unchanged
Similar words: quality
Definition: an essential and distinguishing attribute of something or someone
Usage: the quality of mercy is not strained--Shakespeare
Synonyms: changelessness
Definition: the property of remaining unchanged
Similar words: strength, enduringness, lastingness, durability
Definition: permanence by virtue of the power to resist stress or force
Usage: they advertised the durability of their products