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[in-doo-bi-tuh-buh l, -dyoo-]
See more synonyms for indubitable on Thesaurus.com
  1. that cannot be doubted; patently evident or certain; unquestionable.
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Origin of indubitable

From the Latin word indubitābilis, dating back to 1615–25. See in-3, dubitable
Related formsin·du·bi·ta·bil·i·ty, in·du·bi·ta·ble·ness, nounin·du·bi·ta·bly, adverb

Synonym study

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for indubitable

Historical Examples

  • Her costume had about it an indubitable air, a finality of perfection in its kind.

    Within the Law

    Marvin Dana

  • This charge was doubtful, while the man's practical piety was indubitable.

  • It took me three years to realise it as an indubitable fact.

    The Mistress of Shenstone

    Florence L. Barclay

  • My heart bounded with joy, and I held escape to be indubitable.

  • And yet he knew, with an indubitable knowledge, that he should ask her again.

    A Venetian June

    Anna Fuller

British Dictionary definitions for indubitable


  1. incapable of being doubted; unquestionable
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Derived Formsindubitability or indubitableness, noun

Word Origin

C18: from Latin indubitābilis, from in- 1 + dubitāre to doubt
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 indubitable


mid-15c., from Latin indubitabilis "that cannot be doubted," from in- "not, opposite of" (see in- (1)) + dubitabilis "doubtful," from dubitare "hesitate, doubt" (see doubt).

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Online Etymology Dictionary, © 2010 Douglas Harper