43 entries under unprepared topic. ×

4
automatic(adjective, free, simple, fake, natural)
4
snap(adjective, free, casual, impulsive, prepared)
4
unarranged(adjective, spontaneous, unplanned, unrehearsed)
3
fake(adjective, adverb, free, casual, impulsive)
3
ill-considered(adjective, impulsive, unqualified, unsuspecting)
3
rough-and-ready
3
undevised
2
free(adjective, simple, fake, natural, casual)
2
improvisatory(free, casual, impulsive, spontaneous)
2
unscripted(adjective, adverb, mock, affected, spontaneous)
2
winged(adjective, adverb, informal, unqualified)
1
autoschediastic(free, casual, impulsive, spontaneous)
1
dashed off(expression, adjective, adverb, mock, affected)
1
expedient(free, casual, impulsive, spontaneous)
1
faked(adjective, adverb, mock, affected)
1
jamming(free, casual, impulsive, spontaneous)
1
on-the-spot(free, casual, impulsive, spontaneous)
1
played by ear(expression, adjective, idiom, adverb, unqualified)
1
thrown off(expression, adjective, adverb, mock, affected)
1
toss off(expression, free, casual, impulsive, spontaneous)
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APASmart Define. (2016). impromptu thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/impromptu/thesaurus/synonyms
ChicagoSmart Define. 2016. "impromptu thesaurus" https://smartdefine.org/impromptu/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, impromptu thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/impromptu/thesaurus/synonyms>.
MLASmart Define. "impromptu thesaurus" 28 January 2016. Web. 27 September 2026. <https://smartdefine.org/impromptu/thesaurus/synonyms>