| flashing(adjective, sudden) | |
| flickering(adjective, transient) | |
| flitting(adjective, transient) | |
| flying(fast, summary, rapid, swift, instant) | |
| fugacious(adjective, transientness) | |
| fugitive(adjective, transientness) | |
| impermanent(adjective, transient) | |
| insistent(adjective, prompt, fast, quick, immediate) | |
| little | |
| meteoric | |
| momentaneous | |
| mortal(adjective, transient) | |
| mutable(adjective, transient) | |
| out of the blue(adjective, sudden) | |
| precipitous(adjective, sudden, instantaneity) | |
| present | |
| presto(adjective, quickly) | |
| rootless(adjective, transient) | |
| short-term(adjective, transient) | |
| snap |
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| APA | Smart Define. (2016). instantaneous thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/instantaneous/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "instantaneous thesaurus" https://smartdefine.org/instantaneous/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, instantaneous thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/instantaneous/thesaurus/synonyms>. |
| MLA | Smart Define. "instantaneous thesaurus" 26 February 2016. Web. 23 September 2026. <https://smartdefine.org/instantaneous/thesaurus/synonyms> |