3
time
2
all at once(expression, idiom, ignorantly, unanticipatedly, uniformed)
2
anon(adverb, now, directly, immediately, rapidly)
2
at short notice(expression, adverb, directly, immediately, rapidly)
2
away(adverb, now, directly, immediately, rapidly)
2
demand
2
double
2
flat
2
in a trice(noun, adverb)
2
in short order(expression, idiom, quickly, rapidly, speedily)
2
in two shakes
2
like a shot(expression, idiom, adverb, quickly, rapidly)
2
like greased lightning(expression, idiom, adverb, quickly, rapidly)
2
momentarily
2
nail
2
nowadays(adverb, importance)
2
on the dot(expression, idiom, adverb, directly, rapidly)
2
on the double(expression, idiom, adverb, directly, rapidly)
2
once
2
post-haste(noun, adverb)
11 years ago|4k views|share |citing 
APASmart Define. (2015). without delay thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/without_delay/thesaurus/synonyms
ChicagoSmart Define. 2015. "without delay thesaurus" https://smartdefine.org/without_delay/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, without delay thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/without_delay/thesaurus/synonyms>.
MLASmart Define. "without delay thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/without_delay/thesaurus/synonyms>