Synonyms|310Antonyms|60|Broader|1Narrower|2Related|257
2
overnight
2
punctual
2
quick as lightning(expression, idiom, instantaneity)
2
quick as thought(expression, idiom, instantaneity)
2
rushed(adjective, summary, rapid, swift, instant)
2
short and sweet(expression, idiom, rapid, swift, instant)
2
succinct(rapid, swift, instant)
2
unpremeditated(adjective, impulsive)
2
urgent(adjective, direct, prompt, fast, quick)
2
without delay(expression, idiom, immediate)
1
ASAP(fast, rapid, swift)
1
Band-Aid
1
abruptness(noun, impulsiveness)
1
acting
1
active(fast, rapid, swift)
1
acute(adjective, sudden)
1
ad hoc
1
ad interim
1
alternate
1
animated(fast, rapid, swift)
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ChicagoSmart Define. 2016. "instantaneous thesaurus" https://smartdefine.org/instantaneous/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, instantaneous thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/instantaneous/thesaurus/synonyms>.
MLASmart Define. "instantaneous thesaurus" 26 February 2016. Web. 23 September 2026. <https://smartdefine.org/instantaneous/thesaurus/synonyms>