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  1. incapable of being excused or justified.
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Origin of inexcusable

1375–1425; late Middle English < Latin inexcūsābilis; see in-3, excuse, -able
Related formsin·ex·cus·a·bil·i·ty, in·ex·cus·a·ble·ness, nounin·ex·cus·a·bly, adverb

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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for inexcusable


  1. not able to be excused or justified
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Derived Formsinexcusability or inexcusableness, nouninexcusably, 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

Word Origin and History for inexcusable


early 15c., from Latin inexcusabilis, from in- "not, opposite of" (see in- (1)) + excusabilis, from excusare (see excuse). Related: Inexcusably.

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Online Etymology Dictionary, © 2010 Douglas Harper