Irrefutable

//ˌɪɹɪˈfjuːtəbəl// adj

Definitions

Adjective
  1. 1
    undeniable; unable to be disproved or refuted

    "[…]clear and irrefutable evidence of the Cause I have undertaken"

Adjective
  1. 1
    impossible to deny or disprove wordnet

Etymology

From Late Latin irrefūtābilis, from ir- (“not”) + refūtābilis (“refutable”), from refūtō (“to refute”) + -bilis (“-able”), equivalent to ir- + refutable.

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