Irrefutable

Definition

• Def: Irrefutable 1. that cannot be refuted or disproved; 2. impossible to deny or disprove; "incontrovertible proof of the defendant's innocence"; "proof positive"; "an irrefutable argument";
  
  

• Origin: 1620, from L. irrefutabilis, from in- "not" + refutabilis (see refute);
  
  

• Synonyms: indisputable, incontrovertible, undeniable.
  

Source: Dictionary.com Unabridged