| spur-of-the-moment(adjective, free, fake, informal, casual) | |
| unplanned(adjective, free, informal, casual, impulsive) | |
| unpremeditated(adjective, free, informal, casual, snap) | |
| unprepared(adjective, free, fake, informal, casual) | |
| casual(adjective, free, fake, informal, impulsive) | |
| acting | |
| ad-lib(adjective, free, fake, informal, casual) | |
| ad interim | |
| already(adjective, present, prompt, new, being) | |
| alternate | |
| at first glance(expression, free, informal, casual, snap) | |
| at this moment(expression, adjective, idiom, present, new) | |
| automatic(free, informal, casual, impulsive, unprepared) | |
| autoschediastic(free, casual, impulsive, spontaneous, unprepared) | |
| awhile | |
| begun(adjective, present, prompt, new, being) | |
| being(adjective, present, prompt, new, current) | |
| bout | |
| brief | |
| briefly |
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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> |