[uhn-kwes-chuh-nuh-buh l]


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

First recorded in 1590–1600; un-1 + questionable
Related formsun·ques·tion·a·ble·ness, nounun·ques·tion·a·bly, adverb

Synonym study

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for unquestionable

Contemporary Examples of unquestionable

Historical Examples of unquestionable

  • Perhaps it was his unquestionable distress that weakened her.

    The Black Bag

    Louis Joseph Vance

  • I will afford the most unquestionable demonstration of the veracity of my declarations.


    William Godwin

  • That the Egyptians had stringed instruments is unquestionable.

    How the Piano Came to Be

    Ellye Howell Glover

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

    Aztec Land

    Maturin M. Ballou

  • 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 qualificationan unquestionable decision
Derived Formsunquestionability or 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

Word Origin and History for unquestionable

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

Online Etymology Dictionary, © 2010 Douglas Harper