Synonyms|310Antonyms|60|Broader|1Narrower|2Related|257
1
expeditive(fast, rapid, swift)
1
extemporaneousness(noun, impulsiveness)
1
faster
1
fly-by-night
1
for the time being
1
forthwith
1
going(fast, rapid, swift)
1
harefooted(fast, rapid, swift)
1
hastiness(noun, impulsiveness)
1
high-speed
1
ill-considered(adjective, impulsive)
1
immediately
1
impatient(fast, rapid, swift)
1
impromptu(adjective, impulsive)
1
improvisation(noun, impulsiveness)
1
improvised(adjective, impulsive)
1
impulsiveness(noun, impulsiveness)
1
inconstant
1
inst
1
instantaneously
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APASmart Define. (2016). instantaneous thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/instantaneous/thesaurus/synonyms
ChicagoSmart Define. 2016. "instantaneous thesaurus" https://smartdefine.org/instantaneous/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, instantaneous thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/instantaneous/thesaurus/synonyms>.
MLASmart Define. "instantaneous thesaurus" 26 February 2016. Web. 23 September 2026. <https://smartdefine.org/instantaneous/thesaurus/synonyms>