26 entries under earliness topic. ×

24
immediately(adverb, first, directly, quickly, haste)
19
directly(adverb, fast, quickly, rapidly, instantly)
19
at once(expression, idiom, adverb, directly, immediately)
13
quickly(adverb, fast, rapidly, suddenly)
11
speedily(adverb, fast, quickly, rapidly)
10
suddenly(adverb, suddenly, instantaneity, inexpectation)
8
forthwith(adverb, directly, immediately, quickly, rapidly)
7
apace(adverb, fast, velocity, quickly, rapidly)
5
on the spot(expression, idiom, adverb, directly, immediately)
4
briefly(adverb, transiently)
2
at short notice(expression, idiom, directly, immediately, rapidly)
2
extempore
2
incontinently
2
on the instant(expression, idiom)
2
summarily(first, now, directly, immediately, rapidly)
1
shortly(straight, directly, immediately, quickly, rapidly)
1
straightway
0
a' vue d'oeil(expression, idiom)
0
almost immediately(expression, idiom)
0
at sight(expression, idiom)
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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>