unquestionable

Adjective

• not open to question
  • an unquestionable (or unequivocal) loss of prestige
    

• not counterfeit or copied
  • an authentic signature
    
  • a bona fide manuscript
    
  • an unquestionable antique
    
  • photographs taken in a veritable bull ring
    

• incapable of being questioned
  • unquestionable authority
    

Related words

• Synonyms: 
  authentic , bona fide , veritable