Impossible to refute or disprove; incontrovertible: irrefutable arguments; irrefutable evidence of guilt. (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 "irrefutable" in a sentence
"For readers who fail to grasp Mr. Hersh's point from the subtitle alone, his central contention is that there exists no "irrefutable evidence of an ongoing hidden nuclear-weapons program in Iran"—which is surely right, since the word "irrefutable" allows for no ambiguity."
"These aren't the first accusations but this time the U.S. says it has what it calls irrefutable evidence."
"KING: Nicholas Burns, the undersecretary of state for political affairs on what he calls irrefutable evidence that Iran is supplying arms to the Taliban."