Burton's attitude was to try to prove indisputable facts by weighty quotations. The certificates were produced as indisputable evidence of the ownership of the land. First and foremost was wave theory's long and indisputable success in explaining purely optical phenomena. For biological classification of human beings is an indisputable fact. At that point Charlie's credibility seemed indisputable. Reinhold Messner regarded it as "an indisputable fact". His patriotism is as indisputable as his genius. "The results are overwhelming and indisputable," he said. It would have given a male heir an indisputable claim to the throne. What is indisputable about the grammatical relations is that they are relational. Ibn Hajar al-Asqalani are all agreed upon his indisputable authority. That he has made an excellent record as governor is indisputable. The Dutchman Willem Barents made the first indisputable discovery of Svalbard in 1596. In terms of service there were indisputable improvements. He later becomes jealous and pettily competitive when her skill becomes indisputable.