12
accidentally(adverb, short, sudden, suddenly, unexpectedly)
10
inadvertently(adverb, short, sudden, suddenly, unexpectedly)
7
casually(adverb, intention, accidentally)
7
involuntarily
5
by chance(expression, adjective, idiom, adverb, intention)
5
fortuitously(adjective, adverb, intention, fortunately, luckily)
5
unawares(adverb, suddenly, unexpectedly)
5
unwittingly(adjective, adverb, short, intention, sudden)
4
randomly(adverb, intention, accidentally)
4
unconsciously(adverb, short, sudden, suddenly, unexpectedly)
4
unexpectedly(adverb, short, sudden, suddenly, unawares)
3
by accident(expression, idiom, short, sudden, suddenly)
3
carelessly(adverb, short, sudden, suddenly, unexpectedly)
3
chance
3
circumstantially
3
haphazardly(adjective, adverb, accidentally)
3
instinctively
2
aimlessly(adverb, accidentally)
2
by mistake(expression, idiom, short, sudden, suddenly)
2
causelessly(adverb, accidentally)
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APASmart Define. (2015). unintentionally thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/unintentionally/thesaurus/synonyms
ChicagoSmart Define. 2015. "unintentionally thesaurus" https://smartdefine.org/unintentionally/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, unintentionally thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/unintentionally/thesaurus/synonyms>.
MLASmart Define. "unintentionally thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/unintentionally/thesaurus/synonyms>