un·al·ter·a·ble

[uhn-awl-ter-uh-buhl]
adjective
not capable of being altered, changed, or modified.


Origin:
1610–15; un-1 + alterable

un·al·ter·a·ble·ness, un·al·ter·a·bil·i·ty, noun
un·al·ter·a·bly, adverb
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
unalterable (ʌnˈɔːltərəbəl, -ˈɔːltrəbəl) [Click for IPA pronunciation guide]
 
adj
(of a condition, truth, etc) unable to be changed or altered

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Unalterable is always a great word to know.
So is bezoar. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Example sentences
As mentioned previously, the job descriptions are not unalterable.
There is one unalterable bit of good news that emerged at trial, however, and
  it shouldn't be overlooked.
Though it is often said that only two things in life are certain, maybe only
  one is truly unalterable: taxes.
Once entered, orders and records of changes to orders are unalterable and
  cannot be deleted.
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