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[in-doo-bi-tuh-buh l, -dyoo-] /ɪnˈdu bɪ tə bəl, -ˈdyu-/
that cannot be doubted; patently evident or certain; unquestionable.
Origin of indubitable
1615-25; < Latin indubitābilis. See in-3, dubitable
Related forms
indubitability, indubitableness, noun
indubitably, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for indubitable
Historical Examples
  • That the twain were happy—between their times of sadness—was indubitable.

    Jude the Obscure Thomas Hardy
  • Her costume had about it an indubitable air, a finality of perfection in its kind.

    Within the Law Marvin Dana
  • Nay, there are indubitable proofs that his personal courage could not always be “screwed up to the sticking point.”

    The Indian in his Wigwam Henry R. Schoolcraft
  • It took me three years to realise it as an indubitable fact.

    The Mistress of Shenstone Florence L. Barclay
  • He concluded that there was an indubitable connection between this and the intestinal flora.

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

  • Confectioners' wagons, loads of camp chairs, and now a large awning were the indubitable evidences of what was afoot.

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

    A Venetian June Anna Fuller
  • That it led to such licence in the present among themselves was an indubitable fact.

    A Girl Among the Anarchists Isabel Meredith
  • Call this then his outward conversion; and say, Paul's outward conversion is indubitable.

    Not Paul, But Jesus Jeremy Bentham
British Dictionary definitions for indubitable


incapable of being doubted; unquestionable
Derived Forms
indubitability, 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
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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).

Online Etymology Dictionary, © 2010 Douglas Harper
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