45 entries under informal topic. ×
| impromptu(adjective, free, casual, unplanned) | |
| offhand(adjective, free, casual, impulsive) | |
| ad lib(expression, adjective, free, casual) | |
| immediate(adjective, present, free, fake) | |
| improvised(adjective, free, casual, impulsive) | |
| spontaneous(adjective, free, casual, unplanned) | |
| spur-of-the-moment(adjective, free, fake, casual) | |
| unplanned(adjective, free, casual, impulsive) | |
| unpremeditated(adjective, free, casual, snap) | |
| unprepared(adjective, free, fake, casual) | |
| casual(adjective, free, fake, impulsive) | |
| ad-lib(adjective, free, fake, casual) | |
| at first glance(expression, free, casual, snap) | |
| automatic(free, casual, impulsive, unprepared) | |
| by ear(expression, free, casual, unrehearsed) | |
| extemporaneous(adjective, free, casual, impulsive) | |
| extempore(free, casual, impulsive, unplanned) | |
| free(casual, impulsive, spontaneous, unprepared) | |
| improv(free, casual, impulsive, snap) | |
| improvisatory(free, casual, impulsive, snap) |
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| APA | Smart Define. (2016). ad hoc thesaurus. Retrieved September 29, 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 29, 2026). |
| Harvard | Smart Define 2016, ad hoc thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/ad_hoc/thesaurus/synonyms>. |
| MLA | Smart Define. "ad hoc thesaurus" 26 February 2016. Web. 29 September 2026. <https://smartdefine.org/ad_hoc/thesaurus/synonyms> |