Unchangeable

You'd better really love her; people are unchangeable.

Forget about the campaign. That kind of company policy is practically unchangeable.

But eventually he had come to the conclusion that nothing on earth is unchangeable beyond a certain limit of time.

Less than 15 minutes in, he noted that he had signed an executive order declaring that the federal government will only recognize two unchangeable sexes, male and female, and another order banning trans women from participating in women’s sports.

Psychologists call this the entity theory of intelligence, which is simply the belief that ability is innate and unchangeable.