16
suddenly(adverb, unexpected, suddenly, unawares, abruptly)
15
abruptly(adverb, short, sudden, suddenly, unawares)
8
surprisingly(adverb, short, sudden, suddenly, unawares)
7
hastily(adverb, suddenly, earliness)
7
by chance(expression, idiom, adverb, accident)
7
unawares(adverb, suddenly, abruptly, inexpectation)
6
accidentally(adverb, short, sudden, suddenly, casually)
6
without warning(expression, idiom, adverb, suddenly, unawares)
4
aback(short, unexpected, sudden, suddenly, unawares)
4
all at once(expression, idiom)
4
circumstantially
4
impulsively
4
out of the blue
4
swiftly
4
hurriedly(adverb, suddenly)
4
plump(adverb, inexpectation)
4
pop
4
short(adverb, sudden, suddenly, unawares, abruptly)
4
sudden(short, suddenly, unawares, abruptly, astonishingly)
3
perchance
<1234510>
11 years ago|9.1k views|share |citing 
APASmart Define. (2015). unexpectedly thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/unexpectedly/thesaurus/synonyms
ChicagoSmart Define. 2015. "unexpectedly thesaurus" https://smartdefine.org/unexpectedly/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, unexpectedly thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/unexpectedly/thesaurus/synonyms>.
MLASmart Define. "unexpectedly thesaurus" 13 April 2015. Web. 20 September 2026. <https://smartdefine.org/unexpectedly/thesaurus/synonyms>