74 entries under adverb topic. ×

10
voluntarily(willing, happily, willingly, openly)
9
freely(adjective, impulsive, willing, impromptu)
6
extemporaneously(impromptu, impulsively, improv, extemporaneously)
5
willingly(willing, happily, freely, openly)
5
automatically(improv, extemporaneously)
5
impulsively
3
ad lib(expression, idiom, impromptu, improv)
3
ad libitum(expression, adjective, idiom, improv)
3
by choice(expression, happily, freely, willingly)
3
impromptu(improv, extemporaneously)
3
instinctively
3
involuntarily
3
naturally
3
rashly
2
hastily
2
abruptly
2
ad-lib(manner, improv, extemporaneously)
2
easily(freely, usually, sincerely, simply)
2
haphazardly
2
innately
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APASmart Define. (2015). spontaneously thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/spontaneously/thesaurus/synonyms
ChicagoSmart Define. 2015. "spontaneously thesaurus" https://smartdefine.org/spontaneously/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, spontaneously thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/spontaneously/thesaurus/synonyms>.
MLASmart Define. "spontaneously thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/spontaneously/thesaurus/synonyms>