- Definitions|2
- Thesaurus|1.5k
- Abbreviations|0
| at short notice(expression, idiom) | |
| at sight | |
| at will(expression, adverb, informal, unplanned, extemporize) | |
| automatically(adverb, spontaneously, improv, extemporaneously) | |
| autoschediastic(free, casual, impulsive, spontaneous, unprepared) | |
| break loose(expression, adjective, simple, natural, casual) | |
| cadenza | |
| careless | |
| caught napping | |
| caught off balance(expression, idiom) | |
| caught off guard(expression, idiom, unqualified, unsuspecting, unready) | |
| caught short | |
| dashed off(expression, adjective, adverb, mock, affected) | |
| down(adjective, simple, natural, casual, impulsive) | |
| expedient(free, casual, impulsive, spontaneous, unprepared) | |
| extemporaneousness | |
| extemporariness | |
| extemporize(verb, adjective, informal, unplanned, off-the-cuff) | |
| faked(adjective, adverb, mock, affected, unprepared) | |
| flash |
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| APA | Smart Define. (2016). impromptu thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/impromptu/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "impromptu thesaurus" https://smartdefine.org/impromptu/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2016, impromptu thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/impromptu/thesaurus/synonyms>. |
| MLA | Smart Define. "impromptu thesaurus" 28 January 2016. Web. 21 September 2026. <https://smartdefine.org/impromptu/thesaurus/synonyms> |