Definition of "incommutable" [in•com•mut•a•ble]

• Not able to be exchanged one for another: a rare, incommutable skill. (adjective)
• That cannot be altered: an incommutable death sentence. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "I entered, then, and with the vision of my spirit, such as it was, I saw the incommutable light far above my spiritual ken and transcending my mind: not this common light which every carnal eye can see, nor any light of the same order; but greater, as though this common light were shining much more powerfully, far more brightly, and so extensively as to fill the universe."
• "Now saith S. Leo in a sermon of the Pentecost: The incommutable deity of the Blessed Trinity is without any changing, one in substance, not divided in operation, all one in will, like in omnipotence, equal in glory, and in his mercy."
• "Ils en donnèrent alors leur démission au roi, à condition que l'exercice leur en resteroit dans l'enclos de leur séminaire, et dans leur ferme de St. Gabriel, avec la propriété perpétuelle et incommutable du Greffe de la justice royale, qui seroit établie dans l'isle, et la nomination du premier juge. ""