When looking for synonyms for the word "inalterability", some possible options include immutability, stability, permanence, constancy, unchangeability, and steadfastness. These words all convey a sense of something that is unchanging or that remains consistent over time. They can be applied to a wide variety of situations, from describing the steadfastness of a person's values or beliefs, to talking about the permanence of a physical object or structure. Whether you are writing an academic paper or just trying to expand your vocabulary, using synonyms can help you communicate your ideas more clearly and effectively.