25 entries under earliness topic. ×

21
immediately(adverb, time, punctually)
17
at once(expression, idiom, adverb, time, now)
17
directly(adverb, time, now, immediately, quickly)
12
quickly(adverb, immediately, punctually)
10
speedily(adverb, punctually)
7
instantaneously(adverb, directly, immediately, quickly, rapidly)
6
straight(adverb, directly, immediately)
6
straightway
6
summarily(adverb, delay, directly, immediately, rapidly)
5
on the spot(expression, idiom, directly, immediately, rapidly)
4
apace
3
on the instant(expression, idiom)
3
shortly(adverb, now, directly, immediately, quickly)
2
briefly
2
incontinently
1
almost immediately(expression, idiom)
1
at short notice(expression, idiom, directly, immediately, rapidly)
1
by and by(verb, expression, phrasal verb)
1
extempore
1
in a while(expression, idiom)
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APASmart Define. (2015). forthwith thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/forthwith/thesaurus/synonyms
ChicagoSmart Define. 2015. "forthwith thesaurus" https://smartdefine.org/forthwith/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, forthwith thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/forthwith/thesaurus/synonyms>.
MLASmart Define. "forthwith thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/forthwith/thesaurus/synonyms>