Etymology
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immutable (adj.)

early 15c., "unchanging, unalterable," from Old French immutable (Modern French immuable), and directly from Latin immutabilis "unchangeable, unalterable," from assimilated form of in- "not, opposite of" (see in- (1)) + mutabilis "changeable," from mutare "to change" (from PIE root *mei- (1) "to change, go, move"). Related: Immutably.

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Definitions of immutable

immutable (adj.)
not subject or susceptible to change or variation in form or quality or nature;
the view of that time was that all species were immutable, created by God
Synonyms: changeless
immutable (adj.)
constant and unchanging;
the immutable laws of nature
From wordnet.princeton.edu