1
abrupt(adjective, fast, rapid, swift)
1
accelerated(hot, fast, quick, rapid, speedy)
1
active(adjective, hot, fast, quick, nimble)
1
agile(adjective, hot, fast, quick, nimble)
1
agilely
1
alacrity
1
alert(adjective, fast, rapid, swift)
1
animated(fast, rapid, swift)
1
any minute now(expression, idiom, soon, swiftly, snappily)
1
at flank speed(expression, idiom)
1
before long(expression, soon, swiftly, proximately, snappily)
1
blue streak(expression, hot, quick, nimble, speedy)
1
bright and early(expression, idiom, soon, swiftly, proximately)
1
brisk(hot, fast, quick, rapid, nimble)
1
by airmail
1
by and by(expression, idiom, early, rapidly, soon)
1
by return mail(expression, idiom)
1
carelessly
1
chop chop(expression, soon, swiftly, snappily)
1
coming down the pike(expression, idiom, early, rapidly, soon)
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APASmart Define. (2015). posthaste thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/posthaste/thesaurus/synonyms
ChicagoSmart Define. 2015. "posthaste thesaurus" https://smartdefine.org/posthaste/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, posthaste thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/posthaste/thesaurus/synonyms>.
MLASmart Define. "posthaste thesaurus" 13 April 2015. Web. 25 September 2026. <https://smartdefine.org/posthaste/thesaurus/synonyms>