70 entries under simple topic. ×

24
impromptu(adjective, adverb, free, fake)
20
offhand(adjective, adverb, free, fake)
16
extemporaneous(adjective, informal, natural, chance)
11
spontaneous(adjective, free, fake, informal)
9
ad-lib(adjective, adverb, free, fake)
9
improvised(adjective, free, fake, informal)
9
off-the-cuff(adjective, informal, natural, straightforward)
9
unstudied(adjective, free, fake, natural)
7
casual(adjective, free, fake, natural)
7
unplanned(adjective, free, fake, informal)
5
informal(adjective, free, casual, spontaneous)
2
automatic(adjective, free, fake, natural)
2
free(adjective, fake, natural, straightforward)
2
improv(adjective, free, fake, straightforward)
2
involuntary(adjective, natural, casual, impulsive)
1
break loose(expression, adjective, natural, casual)
1
colloquial(adjective, easy, plain, straightforward)
1
congenial(adjective, easy, plain, straightforward)
1
democratic(adjective, easy, plain, straightforward)
1
down(adjective, natural, casual, impulsive)
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APASmart Define. (2015). extempore thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/extempore/thesaurus/synonyms
ChicagoSmart Define. 2015. "extempore thesaurus" https://smartdefine.org/extempore/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, extempore thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/extempore/thesaurus/synonyms>.
MLASmart Define. "extempore thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/extempore/thesaurus/synonyms>