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Not subject or susceptible to change.
im·mu′ta·bil′i·ty, im·mu′ta·ble·ness n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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|Noun||1.||immutableness - the quality of being incapable of mutation; "Darwin challenged the fixity of species"|
unchangeability, unchangeableness, unchangingness, changelessness - the quality of being unchangeable; having a marked tendency to remain unchanged
unalterability - the quality of not being alterable
agelessness - the quality of being timeless and eternal
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