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indemonstrable

[in-di-mon-struh-buh l, in-dem-uh n-]
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adjective
  1. not demonstrable; incapable of being demonstrated or proved.
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Origin of indemonstrable

First recorded in 1560–70; in-3 + demonstrable
Related formsin·de·mon·stra·bil·i·ty, in·de·mon·stra·ble·ness, nounin·de·mon·stra·bly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for indemonstrable

indemonstrable

adjective
  1. incapable of being demonstrated or proved
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Derived Formsindemonstrability, nounindemonstrably, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012