irrefutable

 
Pronunciation: /ɪˈrɛfjʊtəb(ə)l, ˌɪrɪˈfjuː-/

adjective

  • impossible to deny or disprove: irrefutable evidence

Derivatives

irrefutability

Pronunciation: /-ˈbɪlɪti/
noun

irrefutably

adverb

Origin:

early 17th century: from late Latin irrefutabilis, from in- 'not' + refutabilis (from refutare 'repel, rebut')