The word "unremovable" implies that something cannot be taken away or eliminated. However, there are several synonyms that convey the same meaning in different ways. One alternative could be "permanent," which suggests that something is intended to remain in place indefinitely. Another option could be "irreversible," which implies that the removal of something would be impossible or have serious consequences. "Ineradicable" is a synonym that suggests something cannot be eradicated or completely eliminated, while "immutable" suggests something is unchangeable or unalterable. Lastly, "indestructible" suggests that something cannot be destroyed or damaged beyond repair. All of these synonyms convey the same idea of permanence or immovability as "unremovable".