40 entries under simple topic. ×

2
voluntary(adjective, natural, casual, impulsive)
1
break loose(expression, adjective, natural, casual)
1
down(adjective, natural, casual, impulsive)
1
free(adjective, natural, casual, impulsive)
1
free spirited(expression, adjective, natural, casual)
1
from the hip(expression, adjective, idiom, natural)
1
inevitable(adjective, natural, casual, impulsive)
1
irresistible(adjective, natural, casual, impulsive)
1
off top of head(expression, adjective, idiom, natural)
1
unartful(adjective, natural, casual, impulsive)
1
unavoidable(adjective, natural, casual, impulsive)
1
unbidden(adjective, natural, casual, impulsive)
1
uncompelled(adjective, natural, casual, impulsive)
1
unconstrained(adjective, natural, casual, impulsive)
1
uncontrolled(adjective, natural, casual, impulsive)
1
unforced(adjective, natural, casual, impulsive)
1
unpremediated(adjective, natural, casual, impulsive)
1
unsophisticated(adjective, poor, natural, casual)
1
up front(expression, adjective, natural, casual)
1
willing(adjective, natural, casual, impulsive)
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APASmart Define. (2015). extemporaneous thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/extemporaneous/thesaurus/synonyms
ChicagoSmart Define. 2015. "extemporaneous thesaurus" https://smartdefine.org/extemporaneous/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, extemporaneous thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/extemporaneous/thesaurus/synonyms>.
MLASmart Define. "extemporaneous thesaurus" 13 April 2015. Web. 28 September 2026. <https://smartdefine.org/extemporaneous/thesaurus/synonyms>