153 entries under adjective topic. ×
| volatile | |
| accelerated(fast, rapid, swift, sudden) | |
| alacritous | |
| clamant(prompt, fast, quick, immediate) | |
| discontinuous | |
| exigent(prompt, fast, quick, immediate) | |
| extemporaneous | |
| hair-trigger | |
| headlong(fast, summary, rapid, swift) | |
| impetuous(fast, rapid, swift, sudden) | |
| impulsive(impulsive, sudden) | |
| overnight | |
| punctual | |
| rushed(summary, rapid, swift, instant) | |
| unpremeditated | |
| urgent(direct, prompt, fast, quick) | |
| Band-Aid | |
| acting | |
| acute | |
| ad hoc |
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| APA | Smart Define. (2016). instantaneous thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/instantaneous/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "instantaneous thesaurus" https://smartdefine.org/instantaneous/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2016, instantaneous thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/instantaneous/thesaurus/synonyms>. |
| MLA | Smart Define. "instantaneous thesaurus" 26 February 2016. Web. 25 September 2026. <https://smartdefine.org/instantaneous/thesaurus/synonyms> |