| existent(adjective, present, prompt, new, current) | |
| expedient(adjective, free, appropriate, useful, casual) | |
| extant(adjective, present, new, current, modern) | |
| extemporaneous(adjective, free, informal, casual, impulsive) | |
| extemporary(free, casual, impulsive, spontaneous, unprepared) | |
| extempore(free, informal, casual, impulsive, unplanned) | |
| fading | |
| fake(free, casual, impulsive, spontaneous, unprepared) | |
| fickle | |
| flashing | |
| fleet | |
| fleeting | |
| flickering | |
| flitting | |
| free(informal, casual, impulsive, spontaneous, unprepared) | |
| fugacious | |
| fugitive | |
| going on(expression, adjective, present, new, being) | |
| impermanent | |
| improv(free, informal, casual, impulsive, snap) |
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| APA | Smart Define. (2016). ad hoc thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/ad_hoc/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "ad hoc thesaurus" https://smartdefine.org/ad_hoc/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2016, ad hoc thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/ad_hoc/thesaurus/synonyms>. |
| MLA | Smart Define. "ad hoc thesaurus" 26 February 2016. Web. 25 September 2026. <https://smartdefine.org/ad_hoc/thesaurus/synonyms> |