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1. Not able to be exchanged one for another: a rare, incommutable skill.
2. That cannot be altered: an incommutable death sentence.

in′com·mut′a·bil′i·ty, in′com·mut′a·ble·ness n.
in′com·mut′a·bly adv.
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.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.incommutability - the quality of being not interchangeable
unexchangeability - the quality of being incapable of exchange or interchange
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
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Given the sensuous identity of the de facto ego (it is composed of nothing but sensuous impressions) and the incommutability of these impressions from one self to another, communication cannot be realized through mutual understanding and care; rather, it has to be conducted through exchange of mutual interest and advantage.
Thanks to the incommutability of our bodily sensations, we are, Hume says, epistemologically solipsist and morally selfish.