55 entries under impromptu topic. ×

1
spur of the moment(expression, adverb, free, casual, offhand)
1
unartful(adjective, simple, natural, casual, impulsive)
1
unavoidable(adjective, simple, natural, casual, impulsive)
1
unbidden(adjective, simple, natural, casual, impulsive)
1
uncompelled(adjective, simple, natural, casual, impulsive)
1
unconscious(adjective, simple, natural, casual, impulsive)
1
unconstrained(adjective, simple, natural, casual, impulsive)
1
uncontrolled(adjective, simple, natural, casual, impulsive)
1
unintentional(adjective, simple, natural, chance, casual)
1
unpremediated(adjective, simple, natural, casual, impulsive)
1
unprompted(adjective, simple, natural, casual, impulsive)
1
voluntary(adjective, simple, natural, casual, impulsive)
1
willing(adjective, simple, natural, casual, impulsive)
1
without preparation(expression, idiom, offhand, extemporaneous)
0
throwaway(crude, substitute, temporary, extemporaneous)
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APASmart Define. (2015). improvised thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/improvised/thesaurus/synonyms
ChicagoSmart Define. 2015. "improvised thesaurus" https://smartdefine.org/improvised/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, improvised thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/improvised/thesaurus/synonyms>.
MLASmart Define. "improvised thesaurus" 13 April 2015. Web. 25 September 2026. <https://smartdefine.org/improvised/thesaurus/synonyms>