94 entries under spontaneous topic. ×

24
impromptu(adjective, adverb, free, simple, fake)
20
offhand(adjective, adverb, free, simple, fake)
16
extemporaneous(adjective, simple, informal, natural, chance)
13
extemporary(adjective, free, casual, impulsive, prepared)
13
unpremeditated(adjective, free, planned, impromptu)
12
unprepared(adjective, free, impromptu, unplanned)
11
unrehearsed(adjective, free, prepared, impromptu)
9
ad-lib(adjective, adverb, free, simple, fake)
9
improvised(adjective, free, simple, fake, informal)
9
off-the-cuff(adjective, simple, informal, natural, straightforward)
9
unstudied(adjective, free, simple, fake, natural)
7
casual(adjective, free, simple, fake, natural)
7
spur-of-the-moment(adjective, free, prepared, impromptu)
7
unplanned(adjective, free, simple, fake, informal)
5
informal(adjective, free, simple, casual)
4
makeshift(adjective, free, informal, casual, impulsive)
3
improvisatory(adjective, free, casual, impulsive)
3
unscripted(adjective, unprepared, impromptu, unplanned)
2
automatic(adjective, free, simple, fake, natural)
2
extemporized(adjective, informal, unprepared, unrehearsed)
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APASmart Define. (2015). extempore thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/extempore/thesaurus/synonyms
ChicagoSmart Define. 2015. "extempore thesaurus" https://smartdefine.org/extempore/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, extempore thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/extempore/thesaurus/synonyms>.
MLASmart Define. "extempore thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/extempore/thesaurus/synonyms>