14 entries under instantaneity topic. ×

12
instantaneous(adjective, brief, immediate, transient)
9
hasty(adjective, time, brief, transient, transitory)
5
instant
4
immediate
4
sudden(adjective, brief, immediate, instant, transitory)
3
abrupt(immediate, instant, sudden)
2
discontinuous
2
precipitous(adjective, sudden)
2
quick as lightning(expression, idiom)
2
quick as thought(expression, idiom)
1
precipitate
0
precipitant
0
rapid as electricity(expression, idiom)
0
subitaneous
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APASmart Define. (2016). momentary thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/momentary/thesaurus/synonyms
ChicagoSmart Define. 2016. "momentary thesaurus" https://smartdefine.org/momentary/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2016, momentary thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/momentary/thesaurus/synonyms>.
MLASmart Define. "momentary thesaurus" 26 February 2016. Web. 29 September 2026. <https://smartdefine.org/momentary/thesaurus/synonyms>