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[uhn-kwes-chuh-nuh-buh l] /ʌnˈkwɛs tʃə nə bəl/
not open to question; beyond doubt or dispute; indisputable; undeniable; certain:
an unquestionable fact.
above criticism; unexceptionable:
a man of unquestionable principles.
Origin of unquestionable
1590-1600; un-1 + questionable
Related forms
unquestionableness, noun
unquestionably, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for unquestionable
Contemporary Examples
Historical Examples
  • God to him was the universe, and his mother the unquestionable means of communication with the Providence that governed his life.

    The King of Diamonds Louis Tracy
  • That the Egyptians had stringed instruments is unquestionable.

    How the Piano Came to Be Ellye Howell Glover
  • But, if he gives me his time, he gives me an unquestionable proof of my being in full possession of his heart.

  • This would seem to be such an unquestionable fact as to admit of no argument.

    Aztec Land Maturin M. Ballou
  • Now here is a clear and unquestionable restriction upon the Territories and States.

  • Its plainness troubled him, but its cleanliness was unquestionable.

    The Golden Woman Ridgwell Cullum
British Dictionary definitions for unquestionable


indubitable or indisputable
not admitting of exception or qualification: an unquestionable decision
Derived Forms
unquestionability, unquestionableness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for unquestionable

c.1600, from un- (1) "not" + questionable. Related: Unquestionably.

Online Etymology Dictionary, © 2010 Douglas Harper
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