4
feverishly
4
like a shot(expression, idiom, adverb, instantaneity)
4
like a thunderbolt(expression, idiom, inexpectation)
4
slap
4
summarily
3
unanticipatedly(adverb, unexpectedly, unawares, abruptly, ignorantly)
3
fast
3
momentarily
3
on short notice(expression, idiom)
3
on the spot(expression, idiom, instantaneity, earliness)
3
posthaste
3
precipitantly
3
shortly(adverb, earliness)
3
startlingly(adverb, surprisingly)
3
without notice(expression, idiom, inexpectation)
2
pop
2
at a stroke(expression, idiom, instantaneity)
2
at short notice(expression, idiom, earliness)
2
curtly
2
extempore(instantaneity, earliness)
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APASmart Define. (2015). suddenly thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/suddenly/thesaurus/synonyms
ChicagoSmart Define. 2015. "suddenly thesaurus" https://smartdefine.org/suddenly/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, suddenly thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/suddenly/thesaurus/synonyms>.
MLASmart Define. "suddenly thesaurus" 13 April 2015. Web. 22 September 2026. <https://smartdefine.org/suddenly/thesaurus/synonyms>