93 entries under adjective topic. ×

3
improvisatory(free, casual, impulsive, impulse)
3
involuntary(noun, simple, passionate, violent)
3
natural(simple, casual, impulsive, willing)
3
unarranged(spontaneous, unprepared, unplanned, unrehearsed)
3
unintentional(simple, natural, chance, casual)
3
unscripted(fake, spontaneous, unprepared, impromptu)
2
ad hoc(expression, idiom, free, informal)
2
expedient(free, casual, impulsive, spontaneous)
2
ill-considered(impulsive, unprepared)
2
impetuous(noun, simple, passionate, violent)
2
instantaneous(impulsive, transientness)
2
reflexive
2
unconscious(simple, natural, casual, impulsive)
2
undesigned(unplanned, unintentional, accidental, inadvertent)
2
unintended(chance, unplanned, unintentional, accidental)
2
voluntary(simple, natural, casual, impulsive)
1
autoschediastic(free, casual, impulsive, spontaneous)
1
break loose(expression, simple, natural, casual)
1
down(simple, natural, casual, impulsive)
1
free(simple, natural, casual, impulsive)
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APASmart Define. (2015). extemporaneous thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/extemporaneous/thesaurus/synonyms
ChicagoSmart Define. 2015. "extemporaneous thesaurus" https://smartdefine.org/extemporaneous/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, extemporaneous thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/extemporaneous/thesaurus/synonyms>.
MLASmart Define. "extemporaneous thesaurus" 13 April 2015. Web. 29 September 2026. <https://smartdefine.org/extemporaneous/thesaurus/synonyms>