32 entries under sudden topic. ×
| quick(adjective, prompt, fast, summary, speedy) | |
| immediate(adjective, time, direct, fast, precise) | |
| instant(adjective, time, direct, prompt, precise) | |
| hasty(adjective, fast, impulsive, summary, swift) | |
| fast(adjective, direct, prompt, quick, immediate) | |
| rapid(adjective, fast, precise, responsive, early) | |
| swift(adjective, fast, precise, responsive, summary) | |
| abrupt(adjective, direct, fast, impulsive, summary) | |
| sudden(adjective, fast, summary, swift, immediate) | |
| brisk(adjective, fast, precise, responsive, early) | |
| spontaneous(adjective, impulsive, immediate) | |
| fleeting(adjective, transient, transientness) | |
| hurried(adjective, fast, summary, rapid, swift) | |
| rash(adjective, impulsive) | |
| flashing | |
| out of the blue | |
| precipitous(adjective, instantaneity) | |
| unexpected(adjective, surprising) | |
| accelerated(adjective, fast, rapid, swift) | |
| headlong(adjective, fast, summary, rapid, swift) |
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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> |