55
immediately(noun, adverb, time, first, now)
23
at once(noun, expression, idiom, adverb, time)
21
right away(noun, verb, expression, adverb, phrasal verb)
20
directly(noun, adverb, time, first, now)
20
promptly(noun, adverb, early, now, directly)
20
instantaneously(adverb, first, directly, immediately, quickly)
20
without delay(noun, expression, idiom, adverb, directly)
20
once
20
quickly(adverb, suddenly, punctually)
18
when
15
forthwith(adverb, time, early, now, directly)
15
now(adverb, time, directly, immediately, rapidly)
14
straightaway(adverb, time, first, now, directly)
13
speedily(adverb, early, directly, immediately, quickly)
12
swiftly(adverb, directly, immediately, punctually)
10
straight away(noun, verb, expression, adverb, phrasal verb)
10
straight off(verb, expression, adverb, phrasal verb, time)
10
as soon as(verb, expression, adverb, phrasal verb)
10
instanter(adverb, now, directly, immediately, quickly)
10
momentarily
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APASmart Define. (2016). instantly thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/instantly/thesaurus/synonyms
ChicagoSmart Define. 2016. "instantly thesaurus" https://smartdefine.org/instantly/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, instantly thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/instantly/thesaurus/synonyms>.
MLASmart Define. "instantly thesaurus" 24 February 2016. Web. 20 September 2026. <https://smartdefine.org/instantly/thesaurus/synonyms>