adjective
immutable
ih-MYOO-tuh-bul/ɪˈmjuːtəbl/
Not able to be changed.
The engraved words seem immutable through sunshine and rain.

Etymology
The change root and ability ending make “changeable,” which the negative prefix reverses. Something immutable is therefore not merely unchanged so far, but unable to be altered.
In context
whose Jewishness was perceived to be in their blood and immutable.
More examples
- The software stores each transaction in an immutable record.
- She regards equal treatment as an immutable principle.
- These rules are not immutable; the committee can revise them.
Forms
immutable
immutability noun — The quality of being unable to change.
immutably adverb — In a way that cannot change.
Similar words
- unchangeable
- A more everyday alternative for something that cannot change.
- unalterable
- Often emphasizes that a decision or condition cannot be revised.
- fixed
- Set in place or decided, but not necessarily permanently.