Words similar to unchangeable

Example sentences for: unchangeable

How can you use “unchangeable” in a sentence? Here are some example sentences to help you improve your vocabulary:

They said that if obnoxious behaviors such as aggression and clannishness were innate, that would make them "natural" and hence good; or, even if bad, they would be "in the genes" and hence unchangeable, subverting hopes for social reform.
Genetically influenced behavior is not necessarily good and not necessarily unchangeable.
How many people need words like desiccate, didactic, innocuous, immutable , etc., when dry up, instructive, harmless , and unchanging or unchangeable are around?