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

Examples from the Web for unintentional

Contemporary Examples of unintentional

Historical Examples of unintentional

  • My father did them a hideous wrong, but it was an unintentional wrong.

    The Monster Men

    Edgar Rice Burroughs

  • “Yes, he is dead,” replied Tresler, with unintentional solemnity.

    The Night Riders

    Ridgwell Cullum

  • If I had believed the "garrulity," as she called it, to have been unintentional, I might have been flattered.

    Kent Knowles: Quahaug

    Joseph C. Lincoln

  • It was as unintentional as the birth of a thought in the head, and he heard nothing of it himself.


    Joseph Conrad

  • “I told you that the shooting of the animal was unintentional,” he said.

    Out of the Depths

    Robert Ames Bennet

British Dictionary definitions for unintentional



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 unintentional

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

Online Etymology Dictionary, © 2010 Douglas Harper