Definition of "unchallengeable" []

• Not open to challenge: unchallengeable facts. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Professor John Beddington said that although it is "unchallengeable" that carbon dioxide is warming the planet, climate researchers should be less hostile to those who seek to question their findings."
• "Its the notion of unchallengeable "Truth," whatever its origins, that needs to be done away with ("
• "And it's notable that they did it not by relying on the rules of Chinese criminal procedure, which are full of loopholes and exceptions that the police, with assists from prosecutors and judges, skillfully manipulate to give them unchallengeable leverage over any suspect."