[in-doo-bi-tuh-buh l, -dyoo-]
See more synonyms for indubitable on

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

Related Words for indubitably

certainly, definitely, indeed, positively, surely, undoubtedly

Examples from the Web for indubitably

Contemporary Examples of indubitably

Historical Examples of indubitably

British Dictionary definitions for indubitably


  1. without doubt; certainly


  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 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