30 entries under sudden topic. ×

2
reckless(adjective, quick, speedy, hurried)
2
rushed(adjective, quick, speedy, hurried)
2
urgent(adjective, quick, speedy, hurried)
1
acute
1
instant
1
quickening
1
rushing(verb, adjective)
1
sharp
1
spontaneous
1
without warning
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APASmart Define. (2016). fleeting thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/fleeting/thesaurus/synonyms
ChicagoSmart Define. 2016. "fleeting thesaurus" https://smartdefine.org/fleeting/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2016, fleeting thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/fleeting/thesaurus/synonyms>.
MLASmart Define. "fleeting thesaurus" 29 March 2016. Web. 28 September 2026. <https://smartdefine.org/fleeting/thesaurus/synonyms>