Impossible to refute or controvert; indisputable: irrefragable evidence. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "irrefragable" in a sentence
"By proofs exactly of the same linguistic kind as those by which the modern Spanish, French, and other Latin dialects can be shown to have all radiated from Rome as their centre, the old traditions of the eastern origin of all the chief nations of Europe have been proved to be fundamentally true; for by evidence so "irrefragable" (to use the expression of the Taylorian professor of modern languages at Oxford), that "not an English jury could now-a-days reject it," Philological Archæology has shown that of the three great families of mankind -- the Semitic, the Turanian, and the"
"Responding to the concern that the courts had placed too rigid a test on whistleblowers -- a key precedent demands that an employee have access to "irrefragable proof" before being eligible for protection -- the 111th Congress revised the act so that the test is "whether a disinterested observer with knowledge of the essential facts" could conclude with the whistleblower that the alleged violations were made."
"` The fact, man, the irrefragable fact! 'of Ernest's was ringing in my consciousness."