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[in-doo-bi-tuh-buh l, -dyoo-]
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  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

Related Words for indubitable

apparent, assured, certain, conclusive, evident, indisputable, open, positive, sure, undeniable, unequivocal, unquestionable, irrefragable

Examples from the Web for indubitable

Historical Examples of indubitable

  • 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 for indubitable

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