20 entries under promptly topic. ×

29
immediately(noun, adverb, interjection, time, freely)
22
directly(noun, adverb, time, first, immediately)
13
straightaway(adverb, time, dead, first, now)
12
speedily(adverb, straight, directly, immediately, quickly)
9
straight off(verb, expression, adverb, phrasal verb, time)
7
instanter(adverb, now, directly, immediately, quickly)
5
summarily(adverb, first, now, directly, immediately)
2
on the double(expression, idiom, directly, rapidly, instantly)
1
contiguously(adverb, straight, dead, now, directly)
1
freshly(first, now, directly, immediately)
1
in a second(expression, idiom, adverb, directly, immediately)
1
newly(first, now, directly, immediately)
1
primitively(first, now, directly, immediately)
1
recently(first, now, directly, immediately)
1
seasonably(first, now, directly, immediately)
1
thereon(first, now, directly, immediately)
1
thereupon(adverb, first, now, directly, immediately)
1
timely(first, now, directly, immediately)
0
betimes(adverb, first, now, directly, immediately)
0
early(now, immediately, soon, swiftly, snappily)
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APASmart Define. (2015). at once thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/at_once/thesaurus/synonyms
ChicagoSmart Define. 2015. "at once thesaurus" https://smartdefine.org/at_once/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, at once thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/at_once/thesaurus/synonyms>.
MLASmart Define. "at once thesaurus" 14 April 2015. Web. 29 September 2026. <https://smartdefine.org/at_once/thesaurus/synonyms>