54 entries under adverb topic. ×

27
offhand(adjective, free, simple, fake)
27
unprepared(adjective, free, ready, spontaneous)
24
extemporaneous(adjective, simple, informal, natural)
24
extempore(adjective, free, simple, fake)
22
spontaneous(adjective, free, impulsive, willing)
14
unpremeditated(adjective, free, impulsive, planned)
13
ad lib(expression, adjective, idiom, free)
13
off the cuff(expression, adjective, idiom, free)
13
ad-lib(noun, adjective, free, simple)
12
makeshift(adjective, free, spontaneous, unprepared)
12
off-the-cuff(adjective, simple, informal, natural)
10
spur-of-the-moment(adjective, free, prepared, spontaneous)
9
unstudied(adjective, free, simple, fake)
9
improviso(adjective, free, impulse, spontaneous)
6
ad libitum(expression, adjective, idiom, informal)
6
extemporaneously(impulse, offhand, spontaneously, improv)
5
extemporized(adjective, informal, unprepared, unplanned)
5
improv(adjective, free, offhand, unprepared)
5
impulsive(adjective, simple, natural, chance)
4
spontaneously(improv, extemporaneously)
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APASmart Define. (2016). impromptu thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/impromptu/thesaurus/synonyms
ChicagoSmart Define. 2016. "impromptu thesaurus" https://smartdefine.org/impromptu/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, impromptu thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/impromptu/thesaurus/synonyms>.
MLASmart Define. "impromptu thesaurus" 28 January 2016. Web. 23 September 2026. <https://smartdefine.org/impromptu/thesaurus/synonyms>