33
immediately(noun, adjective, adverb, quick, first)
29
quickly(adverb, fast, rapidly, pronto, punctually)
25
speedily(adverb, time, fast, early, timely)
23
instantly(noun, adverb, early, now, directly)
22
without delay(noun, expression, idiom, adverb, directly)
21
directly(noun, adverb, fast, quickly, rapidly)
21
swiftly(adverb, fast, quickly, rapidly, pronto)
20
at once(noun, expression, idiom, adverb, now)
20
pronto(adjective, adverb, fast, immediately, quickly)
18
right away(noun, verb, expression, adverb, phrasal verb)
13
instantaneously(adverb, fast, quickly, rapidly, pronto)
13
rapidly(adverb, fast, quickly, pronto)
13
straight away(noun, verb, expression, adverb, phrasal verb)
13
fast(adjective, adverb, quickly, rapidly, pronto)
12
soon(adverb, quick, directly, immediately, quickly)
12
forthwith(adverb, now, directly, immediately, quickly)
12
hastily(adverb, fast, quickly, rapidly, pronto)
11
readily(adverb, directly, immediately, quickly, heartily)
10
hurriedly(adverb, fast, quickly, rapidly, pronto)
9
apace(adverb, fast, quickly, rapidly, pronto)
<1234510>
10 years ago|10k views|share |citing 
APASmart Define. (2016). promptly thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/promptly/thesaurus/synonyms
ChicagoSmart Define. 2016. "promptly thesaurus" https://smartdefine.org/promptly/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, promptly thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/promptly/thesaurus/synonyms>.
MLASmart Define. "promptly thesaurus" 21 March 2016. Web. 22 September 2026. <https://smartdefine.org/promptly/thesaurus/synonyms>