irrefragable

[ih-ref-ruh-guh-buhl]
adjective
not to be disputed or contested.

Origin:
1525–35; < Late Latin irrefragābilis, equivalent to Latin ir- ir-2 + refragā() to resist, oppose + -bilis -ble

irrefragability, irrefragableness, noun
irrefragably, adverb
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World English Dictionary
irrefragable (ɪˈrɛfrəɡəbəl)
 
adj
not able to be denied or refuted; indisputable
 
[C16: from Late Latin irrefrāgābilis, from Latin ir- + refrāgārī to resist, thwart]
 
irrefraga'bility
 
n
 
ir'refragableness
 
n
 
ir'refragably
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

irrefragable
"that cannot be refuted," 1533, from L.L. irrefragabilis, from L. in- "not" + refragari "to oppose, contest," from re- "back" + frag-, base of frangere "to break" (see fraction).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Having this irrefragable evidence in favor of the wisdom of their course they took courage and went on as they had begun.
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