2
incidentally
2
mistakenly(adverb, short, sudden, suddenly, unexpectedly)
2
spontaneously
2
subconsciously
2
undesignedly
2
unintendedly
2
unknowingly(adverb, short, sudden, suddenly, unexpectedly)
2
unpremeditatedly
1
ignorantly(adverb, short, sudden, suddenly, unexpectedly)
1
aback(short, sudden, suddenly, unexpectedly, unawares)
1
abruptly(short, sudden, suddenly, unexpectedly, unawares)
1
adventitiously(adverb, accidentally)
1
automatically
1
by surprise(expression, short, sudden, suddenly, unexpectedly)
1
coincidentally
1
compulsively
1
fatally(adverb, accidentally)
1
fortunately(adverb, accidentally)
1
heedlessly
1
inattentively
11 years ago|2.9k views|share |citing 
APASmart Define. (2015). unintentionally thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/unintentionally/thesaurus/synonyms
ChicagoSmart Define. 2015. "unintentionally thesaurus" https://smartdefine.org/unintentionally/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, unintentionally thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/unintentionally/thesaurus/synonyms>.
MLASmart Define. "unintentionally thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/unintentionally/thesaurus/synonyms>