not intentional or deliberate: an unintentional omission from the list.

Origin of unintentional

First recorded in 1775–85; un-1 + intentional
Related formsun·in·ten·tion·al·ly, adverb

Synonyms for unintentional

accidental, unplanned, inadvertent.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Related Words for unintentionally

involuntarily, accidentally, inadvertently, incidentally

Examples from the Web for unintentionally

Contemporary Examples of unintentionally

Historical Examples of unintentionally

  • Unintentionally, Pierre heard her and understood everything.

  • But is it better to do wrong intentionally or unintentionally?

  • But either I do not corrupt them, or I corrupt them unintentionally; and on either view of the case you lie.



  • My niece (as I once called her) mortified me unintentionally; she said I was ageing.

    The Memoires of Casanova, Complete

    Jacques Casanova de Seingalt

  • Captain Abrams had unintentionally contributed to Alfred's discontent.

British Dictionary definitions for unintentionally



not deliberate; accidentalthe killing had been unintentional
Derived Formsunintentionally, adverb
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 unintentionally



1782, from un- (1) "not" + intentional. Related: Unintentionally (1769).

Online Etymology Dictionary, © 2010 Douglas Harper