17
extemporaneous(adjective, adverb, impulsive, prepared, spontaneous)
14
impromptu(adjective, free, impulsive, prepared, spontaneous)
12
offhand(adjective, adverb, free, impulsive, prepared)
11
extempore(adjective, free, prepared, spontaneous, impromptu)
10
improvised(adjective, adverb, free, impulsive, prepared)
10
spontaneous(adjective, free, impulsive, unprepared, impromptu)
9
ad-lib(adjective, adverb, impulsive, prepared, spontaneous)
9
extemporary(adjective, free, casual, impulsive, prepared)
9
unprepared(adjective, free, ready, spontaneous, impromptu)
7
ad lib(expression, adjective, idiom, adverb, free)
7
off the cuff(expression, adjective, idiom, adverb, free)
6
impulsive(adjective, impulsive, spontaneous, unplanned, unprompted)
6
off-the-cuff(adjective, adverb, informal, impulsive, prepared)
6
spur-of-the-moment(adjective, free, prepared, spontaneous, unprepared)
6
unplanned(adjective, free, informal, casual, unqualified)
6
unpremeditated(adjective, free, impulsive, spontaneous, unprepared)
6
unstudied(adjective, free, casual, impulsive, spontaneous)
5
offhanded
3
makeshift(adjective, free, informal, casual, spontaneous)
3
unscripted(adjective, spontaneous, unprepared, impromptu, unplanned)
<123458>
11 years ago|3.9k views|share |citing 
APASmart Define. (2015). unrehearsed thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/unrehearsed/thesaurus/synonyms
ChicagoSmart Define. 2015. "unrehearsed thesaurus" https://smartdefine.org/unrehearsed/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, unrehearsed thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/unrehearsed/thesaurus/synonyms>.
MLASmart Define. "unrehearsed thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/unrehearsed/thesaurus/synonyms>