55 entries under impromptu topic. ×

18
spontaneous(adjective, free, impulsive, willing, impulse)
18
extemporaneous(adjective, simple, informal, natural, chance)
16
unrehearsed(adjective, adverb, free, impulsive, prepared)
8
extempore(adjective, free, simple, fake, informal)
8
offhand(adjective, free, simple, fake, natural)
8
unprepared(adjective, free, ready, spontaneous, unprepared)
7
ad-lib(adjective, adverb, free, simple, fake)
7
extemporary(adjective, free, casual, impulsive, prepared)
6
off-the-cuff(adjective, adverb, simple, informal, natural)
6
unplanned(adjective, free, simple, fake, informal)
5
casual(adjective, free, simple, fake, natural)
4
impulsive(adjective, adverb, simple, natural, chance)
4
off the cuff(expression, adjective, idiom, adverb, free)
4
unstudied(adjective, free, simple, fake, natural)
3
spur-of-the-moment(adjective, free, prepared, spontaneous, unprepared)
3
unscripted(adjective, spontaneous, unprepared, unplanned)
2
automatic(adjective, free, simple, fake, natural)
2
free(adjective, simple, fake, natural, casual)
2
improviso(adjective, free, spontaneous, unprepared)
2
made-up(adjective, free, impulsive, unrehearsed)
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APASmart Define. (2015). improvised thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/improvised/thesaurus/synonyms
ChicagoSmart Define. 2015. "improvised thesaurus" https://smartdefine.org/improvised/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, improvised thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/improvised/thesaurus/synonyms>.
MLASmart Define. "improvised thesaurus" 13 April 2015. Web. 23 September 2026. <https://smartdefine.org/improvised/thesaurus/synonyms>