im·mu·ta·ble

[ih-myoo-tuh-buhl]
adjective
not mutable; unchangeable; changeless.

Origin:
1375–1425; late Middle English < Latin immūtābilis. See im-2, mutable

im·mu·ta·bil·i·ty, im·mu·ta·ble·ness, noun
im·mu·ta·bly, adverb
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
immutable (ɪˈmjuːtəbəl) [Click for IPA pronunciation guide]
 
adj
unchanging through time; unalterable; ageless: immutable laws
 
immuta'bility
 
n
 
im'mutableness
 
n
 
im'mutably
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Immutable is a GRE word you need to know.
So is turbid. Does it mean:
deviating from or inconsistent with the common order, form, or rule; not fitting into a common or type or pattern
confused; muddled; disturbed.
Etymonline
Word Origin & History

immutable
1412, from O.Fr. immutable, from L. immutabilis "unchangeable," from in- "not" + mutabilis "changeable," from mutare "to change" (see mutable).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
More and more of life dripped down beneath him, reduced by the immutable laws
  and relaxed habits of the animal kingdom.
Scientists once believed that long-term memories were immutable.
Bush entirely subscribed to his parents' and grandparents' view of absolute and
  immutable values, of privilege balanced by duty.
The outer sphere of fixed stars was retained and held to be immutable.
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