Also found in: Thesaurus.


Not open to challenge: unchallengeable facts.

un·chal′lenge·a·bly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


in a way that cannot be challenged; in an unchallengeable manner
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
This is so because the time 'long ago' when things came into being is both indefinite and 'still part of the present' and has 'an unchallengeably sacred authority' (1979:24)--hence its sense being translatable as 'The Law'.
United Europe; a wider Holy Roman Empire; a New Order without the Nazis; a federation of European nations with a place for England, France, Spain, Wales, Brittany, Lithuania, Flanders, the Grand Duchy of Muscovy and all the rest; a forest of ancient flags on a green ground; an empire of extreme diversity, prosperous but aware that prosperity is not all; peaceable but unchallengeably strong in its own defence; a Europe taking its place once more as the natural centre and summit of the world.
(28) He had prestige which was close to being unchallengeably high.