66 entries under spontaneous topic. ×

4
improviso(adjective, free, casual, unprepared)
4
instinctive(noun, adjective, simple, passionate, violent)
4
uncontrived(adjective, simple, natural, casual, impulsive)
4
unprompted(adjective, simple, plain, violent, natural)
3
extemporized(adjective, fake, informal, unprepared)
3
fake(adjective, free, casual, impulsive)
3
immediate(noun, adjective, free, casual, impulsive)
3
improvisatory(adjective, free, casual, impulsive, impulse)
3
involuntary(noun, adjective, simple, passionate, violent)
3
natural(adjective, simple, casual, impulsive, willing)
3
unarranged(adjective, unprepared, unplanned, unrehearsed)
3
unintentional(adjective, simple, natural, chance, casual)
3
unscripted(adjective, fake, unprepared, impromptu)
2
expedient(adjective, free, casual, impulsive)
2
impetuous(noun, adjective, simple, passionate, violent)
2
unconscious(adjective, simple, natural, casual, impulsive)
2
voluntary(adjective, simple, natural, casual, impulsive)
1
autoschediastic(adjective, free, casual, impulsive)
1
break loose(expression, adjective, simple, natural, casual)
1
down(adjective, simple, natural, casual, impulsive)
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APASmart Define. (2015). extemporaneous thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/extemporaneous/thesaurus/synonyms
ChicagoSmart Define. 2015. "extemporaneous thesaurus" https://smartdefine.org/extemporaneous/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2015, extemporaneous thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/extemporaneous/thesaurus/synonyms>.
MLASmart Define. "extemporaneous thesaurus" 13 April 2015. Web. 30 September 2026. <https://smartdefine.org/extemporaneous/thesaurus/synonyms>