32 entries under sudden topic. ×
| impetuous(adjective, fast, rapid, swift) | |
| impulsive(adjective, impulsive) | |
| rushed(adjective, summary, rapid, swift, instant) | |
| urgent(adjective, direct, prompt, fast, quick) | |
| acute | |
| brash | |
| brusque | |
| quickening | |
| reckless | |
| rushing | |
| sharp | |
| without warning |
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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> |