12
quick(adjective, adverb, fast, rapidly, soon)
12
expeditiously(adverb, immediately, rapidly, soon, hastily)
11
right away(verb, expression, adverb, phrasal verb, interjection)
11
suddenly(adverb, now, hastily, suddenly, unexpectedly)
10
chop-chop(adverb, fast, rapidly, pronto)
9
like a shot(idiom, adverb, fast, rapidly, pronto)
8
in haste(adverb, fast, rapidly, pronto)
8
sharply(adverb, cunningly, wittily, punctually)
8
straightaway(adverb, directly)
7
briefly(adjective, adverb, earliness)
7
posthaste(adjective, adverb, fast, immediately, rapidly)
7
presto(adverb, rapidly, speedily)
7
swift(adjective, rapidly, swiftly, snappily, speedily)
6
at speed(adverb, fast, rapidly, pronto)
6
double-quick(adverb, soon, hastily, swiftly, snappily)
6
fleetly(adverb, immediately, rapidly, soon, hastily)
6
full tilt(expression, idiom, adverb, fast, rapidly)
6
in no time(expression, idiom, adverb, rapidly, soon)
6
like greased lightning(expression, idiom, adverb, fast, rapidly)
6
readily
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APASmart Define. (2016). quickly thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/quickly/thesaurus/synonyms
ChicagoSmart Define. 2016. "quickly thesaurus" https://smartdefine.org/quickly/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, quickly thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/quickly/thesaurus/synonyms>.
MLASmart Define. "quickly thesaurus" 21 March 2016. Web. 22 September 2026. <https://smartdefine.org/quickly/thesaurus/synonyms>