Also means
immutable
Usage Note
Immuable describes something that does not and cannot change: laws, principles, habits, or natural constants. It is formally registered; invariable or permanent are everyday alternatives. The adverb immuablement (unchangingly) is used in literary prose. The feminine form is identical: une vérité immuable.
Examples
"Il suit un rituel immuable chaque matin."
Natural Translation
He follows an unchanging ritual every morning.

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