55 entries under rapidly topic. ×

19
directly(adverb, fast, quickly, instantly)
19
at once(expression, idiom, adverb, directly, immediately)
19
instantly(adverb, first, directly, immediately, quickly)
17
promptly(adverb, fast, quickly, instantly)
14
without delay(expression, idiom, adverb, directly, immediately)
13
abruptly(adverb, fast, quickly, instantly)
13
quickly(adverb, fast, suddenly, earliness)
12
right away(verb, expression, adverb, phrasal verb, directly)
11
pronto(adverb, fast, quickly)
11
speedily(adverb, fast, quickly, earliness)
11
swiftly(adverb, fast, velocity, quickly)
10
hastily(adverb, fast, quickly, suddenly)
10
instanter(adverb, directly, immediately, quickly)
8
forthwith(adverb, directly, immediately, quickly)
7
apace(adverb, fast, velocity, quickly)
7
in haste(expression, idiom, adverb, fast, quickly)
6
in a flash(expression, idiom, adverb, directly, immediately)
6
straight away(verb, expression, adverb, phrasal verb, directly)
5
hurriedly(adverb, fast, quickly, pronto)
5
in a jiffy(expression, idiom, adverb, directly, immediately)
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APASmart Define. (2015). instantaneously thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/instantaneously/thesaurus/synonyms
ChicagoSmart Define. 2015. "instantaneously thesaurus" https://smartdefine.org/instantaneously/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, instantaneously thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/instantaneously/thesaurus/synonyms>.
MLASmart Define. "instantaneously thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/instantaneously/thesaurus/synonyms>