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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
From the Latin word indubitābilis, dating back to 1615-25. See in-3, dubitable
Related forms
indubitability, indubitableness, noun
indubitably, adverb
Synonym Study
See doubtless. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for indubitably
Contemporary Examples
Historical Examples
  • Ellen turned so indubitably curious a look upon her at this that Miss Sophia half laughed and went on.

    The Wide, Wide World Susan Warner
  • The time had been discreetly chosen—the coast was indubitably clear.

    The Convert Elizabeth Robins
  • The defence, which would be inadequate if it was true, is indubitably incorrect.

  • Coupled with his swinging corn tax, it was indubitably a stout platform.

    The Freelands John Galsworthy
  • For indubitably the much-married may plume themselves upon being also the widely sought.

    Tiverton Tales Alice Brown
  • This interpretation is indubitably close to ours, though not to be confused with it.

    The Mind and the Brain Alfred Binet
  • Yet even a petty supremacy awes the petty, and the sly Welsh girl was indubitably awed.

    A Lost Cause Cyril Arthur Edward Ranger Gull
British Dictionary definitions for indubitably


without doubt; certainly


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 indubitably

late 15c., from indubitable + -ly (2).



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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