64
speedily(adverb, fast, rapidly, hastily, earliness)
62
swiftly(adverb, fast, rapidly, hastily, pronto)
56
rapidly(adverb, fast, hastily, pronto)
44
promptly(adverb, fast, immediately, rapidly, pronto)
35
immediately(adjective, adverb, interjection, now, rapidly)
33
instantly(adverb, immediately, suddenly, punctually)
28
hastily(adverb, fast, rapidly, hastily, suddenly)
26
at once(expression, idiom, adverb, now, immediately)
25
instantaneously(adverb, fast, immediately, rapidly, suddenly)
24
directly(adverb, fast, immediately, rapidly, earliness)
22
pronto(adjective, adverb, informal, fast, immediately)
22
abruptly(adverb, fast, rapidly, hastily, suddenly)
20
fast(verb, adjective, adverb, fast, rapidly)
19
apace(adverb, fast, rapidly, earliness, pronto)
17
lickety-split(adjective, adverb, informal, fast)
16
hurriedly(adverb, fast, rapidly, hastily, pronto)
16
briskly(adverb, fast, rapidly, hastily, pronto)
16
forthwith(adverb, immediately, earliness, punctually)
15
without delay(expression, idiom, adverb, straight, now)
12
soon(adjective, adverb, immediately, rapidly, soon)
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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>