89 entries under adverb topic. ×

24
immediately(first, directly, quickly, haste)
19
directly(fast, quickly, rapidly, instantly)
19
at once(expression, idiom, directly, immediately)
19
instantly(first, directly, immediately, quickly)
17
promptly(fast, quickly, rapidly, instantly)
14
without delay(expression, idiom, directly, immediately)
13
abruptly(fast, quickly, rapidly, instantly)
13
quickly(fast, rapidly, suddenly, earliness)
12
right away(verb, expression, phrasal verb, directly)
11
pronto(fast, quickly, rapidly)
11
rapidly(fast, quickly, pronto)
11
speedily(fast, quickly, rapidly, earliness)
11
swiftly(fast, velocity, quickly, rapidly)
10
hastily(fast, quickly, rapidly, suddenly)
10
instanter(directly, immediately, quickly, rapidly)
10
suddenly(suddenly, instantaneity, earliness, inexpectation)
9
outright
8
forthwith(directly, immediately, quickly, rapidly)
8
momentarily
7
apace(fast, velocity, quickly, rapidly)
11 years ago|5.1k views|share |citing 
APASmart Define. (2015). instantaneously thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/instantaneously/thesaurus/synonyms
ChicagoSmart Define. 2015. "instantaneously thesaurus" https://smartdefine.org/instantaneously/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, instantaneously thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/instantaneously/thesaurus/synonyms>.
MLASmart Define. "instantaneously thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/instantaneously/thesaurus/synonyms>