64 entries under fast topic. ×
| quick(adjective, prompt, summary, speedy) | |
| immediate(adjective, time, direct, precise) | |
| hasty(adjective, impulsive, summary, swift) | |
| prompt(adjective, direct, quick, responsive) | |
| rapid(adjective, precise, responsive, early) | |
| swift(adjective, precise, responsive, summary) | |
| abrupt(adjective, direct, impulsive, summary) | |
| sudden(adjective, summary, swift, immediate) | |
| brisk(adjective, precise, responsive, early) | |
| speedy(adjective, direct, precise, responsive) | |
| brief(adjective, short, swift, immediate) | |
| cursory(adjective, rapid, swift, instant) | |
| hurried(adjective, summary, rapid, swift) | |
| direct(adjective, prompt, quick, immediate) | |
| expeditious(adjective, precise, responsive, summary) | |
| fleet(adjective, summary, rapid, swift) | |
| express(verb, adjective, summary, rapid) | |
| flying(summary, rapid, swift, instant) | |
| insistent(adjective, prompt, quick, immediate) | |
| accelerated(adjective, rapid, swift, sudden) |
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| APA | Smart Define. (2016). instantaneous thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/instantaneous/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "instantaneous thesaurus" https://smartdefine.org/instantaneous/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, instantaneous thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/instantaneous/thesaurus/synonyms>. |
| MLA | Smart Define. "instantaneous thesaurus" 26 February 2016. Web. 24 September 2026. <https://smartdefine.org/instantaneous/thesaurus/synonyms> |