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irrefutable

[ih-ref-yuh-tuh-buh l, ir-i-fyoo-tuh-buh l] /ɪˈrɛf yə tə bəl, ˌɪr ɪˈfyu tə bəl/
adjective
1.
that cannot be refuted or disproved:
irrefutable logic.
Origin
1610-1620
1610-20; < Late Latin irrefūtābilis. See ir-2, refutable
Related forms
irrefutability, irrefutableness, noun
irrefutably, adverb
Synonyms
indisputable, incontrovertible, undeniable.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for irrefutableness

irrefutable

/ɪˈrɛfjʊtəbəl; ˌɪrɪˈfjuːtəbəl/
adjective
1.
impossible to deny or disprove; incontrovertible
Derived Forms
irrefutability, irrefutableness, noun
irrefutably, 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
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Word Origin and History for irrefutableness
irrefutable
1620, from L. irrefutabilis, from in- "not" + refutabilis (see refute).
Online Etymology Dictionary, © 2010 Douglas Harper
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