irrefutable
ir·re·fu·table
adjective
1.
Origin
From Late Latin irrefūtābilis, from ir- (“not”) + refūtābilis (“refutable”), from refūtō (“to refute”) + -bilis (“-able”), equivalent to ir- + refutable.
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.