[uhn-kwes-chuh-nuh-buh l]
See more synonyms for unquestionable on Thesaurus.com
  1. not open to question; beyond doubt or dispute; indisputable; undeniable; certain: an unquestionable fact.
  2. 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. 2018

Examples from the Web for unquestionably

Contemporary Examples of unquestionably

Historical Examples of unquestionably

British Dictionary definitions for unquestionably


  1. indisputably; definitelyan unquestionably great club
  2. (sentence modifier) without a doubt; certainlyunquestionably there were costs incurred


  1. indubitable or indisputable
  2. 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 unquestionably



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

Online Etymology Dictionary, © 2010 Douglas Harper