| momentary | |
| mortal | |
| mutable | |
| off-the-cuff(adjective, informal, spontaneous, unprepared, impromptu) | |
| off the cuff(expression, idiom, free, casual, unrehearsed) | |
| off the top of head(expression, free, informal, casual, snap) | |
| on-the-spot(free, informal, casual, impulsive, snap) | |
| on impulse(expression, free, informal, casual, unrehearsed) | |
| overnight | |
| passing | |
| perishable | |
| place | |
| present(adjective, new, current, modern, contemporary) | |
| present-day(adjective, present, prompt, current, modern) | |
| pro tempore | |
| prompt(adjective, present, new, current, modern) | |
| provisionary | |
| provisory | |
| quick | |
| quickly |
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| APA | Smart Define. (2016). ad hoc thesaurus. Retrieved September 26, 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 26, 2026). |
| Harvard | Smart Define 2016, ad hoc thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/ad_hoc/thesaurus/synonyms>. |
| MLA | Smart Define. "ad hoc thesaurus" 26 February 2016. Web. 26 September 2026. <https://smartdefine.org/ad_hoc/thesaurus/synonyms> |