Synonyms|744Antonyms|104|Broader|6Narrower|5Related|904
3
dead
3
electrifying(adjective, extraordinary, wonderful, affected, shocking)
3
extemporaneous(noun, thoughtless, impetuous, unwary, transientness)
3
fast-paced
3
fleeting(adjective, quick, brief, immediate, instant)
3
hastily
3
impatient(adjective, keen, energetic, violent, careless)
3
instinctive(noun, adjective, passionate, violent, thoughtless)
3
prompt(adjective, fast, quick, summary, speedy)
3
spasmodic(adjective, unexpected, quickly)
3
surprise(noun, inexpectation)
3
unawares(adverb, suddenly, unexpectedly, abruptly, ignorantly)
3
unlooked-for
3
unpredicted(extraordinary, wonderful, shocking, astonishing, astounding)
3
unpremeditated(noun, adjective, passionate, violent, careless)
2
abruptness
2
astounding(adjective, surprising)
2
automatic(adjective, thoughtless, impetuous, unwary)
2
breathless(adjective, keen, violent, anxious, eager)
2
chance(noun, extraordinary, careless, wonderful, casual)
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ChicagoSmart Define. 2016. "sudden thesaurus" https://smartdefine.org/sudden/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, sudden thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/sudden/thesaurus/synonyms>.
MLASmart Define. "sudden thesaurus" 26 February 2016. Web. 23 September 2026. <https://smartdefine.org/sudden/thesaurus/synonyms>