2
rash(adjective, violent, fast, quick)
2
snappy
2
surprise(adjective, unpredictable, secret, unexpected)
2
uncalculated(adjective, secret, unexpected)
2
unforeseeable(unpredictable, secret, unexpected, liable, dependent)
2
unprepared for(expression, proximately, oversoon)
2
unsuspected(adjective, secret)
2
without warning(adjective, violent, fast, quick, shocking)
1
before appointed time(expression, adjective, adverb, quick, immediate)
1
on short notice(expression, adjective, idiom, quick, immediate)
1
on the dot(expression, adjective, idiom, quick, immediate)
1
overearly(adjective, adverb, quick, immediate, beforehand)
1
oversoon(adjective, adverb, quick, immediate, beforehand)
1
preexistent(adjective, adverb, quick, immediate, beforehand)
1
against all expectation(expression, idiom, inexpectation)
1
against expectation(expression, idiom, inexpectation)
1
beyond expectation(expression, idiom, inexpectation)
1
breakneck(violent, fast, quick)
1
brief(violent, fast, quick)
1
brisk
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APASmart Define. (2015). unanticipated thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/unanticipated/thesaurus/synonyms
ChicagoSmart Define. 2015. "unanticipated thesaurus" https://smartdefine.org/unanticipated/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, unanticipated thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/unanticipated/thesaurus/synonyms>.
MLASmart Define. "unanticipated thesaurus" 13 April 2015. Web. 25 September 2026. <https://smartdefine.org/unanticipated/thesaurus/synonyms>