85 entries under voluntary topic. ×

2
effortless(adjective, natural, spontaneous)
2
free(adjective, simple, natural, casual, impulsive)
2
genuine(adjective, natural, spontaneous)
2
improvised(adjective, simple, natural, casual, impulsive)
2
independent(natural, spontaneous)
2
optional(natural, spontaneous)
2
uncalled-for(adjective, willing, arrogant, unwelcome)
2
uncompelled(adjective, simple, natural, casual, impulsive)
2
unforced(adjective, simple, natural, casual, impulsive)
2
unintentional(adjective, simple, natural, casual, impulsive)
2
unwanted(adjective, willing, arrogant, unwelcome)
2
unwitting(adjective, natural, spontaneous, forced)
2
volunteer(natural, spontaneous)
2
willful(natural, spontaneous)
1
ad-lib(adjective, adverb, simple, violent, natural)
1
break loose(expression, adjective, simple, natural, casual)
1
casual(adjective, simple, natural, impulsive, willing)
1
down(adjective, simple, natural, casual, impulsive)
1
extempore(adjective, simple, natural, casual, impulsive)
1
free spirited(expression, adjective, simple, natural, casual)
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APASmart Define. (2015). unprompted thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/unprompted/thesaurus/synonyms
ChicagoSmart Define. 2015. "unprompted thesaurus" https://smartdefine.org/unprompted/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2015, unprompted thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/unprompted/thesaurus/synonyms>.
MLASmart Define. "unprompted thesaurus" 14 April 2015. Web. 30 September 2026. <https://smartdefine.org/unprompted/thesaurus/synonyms>