Not changeable; incapable of being changed or of changing; immutable.

Something that cannot be changed.

The quality or state of being unchangeable; immutability.

plural of unchangeable

Not changed or altered; remaining in an original state.

simple past tense and past participle of unchange

remaining constantly unchanged

present participle of unchange

In a way that cannot be varied, or changed.

(uncountable) The property of being unchangeable / (countable) The extent to which something is unchangeable