indubitable

[in-doo-bi-tuh-buh l, -dyoo-]
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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

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British Dictionary definitions for indubitable

indubitable

adjective
  1. incapable of being doubted; unquestionable
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
adj.

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