54 entries under free topic. ×

7
unasked(adjective, feature, characteristic, keen)
7
unbidden(adjective, simple, keen, happy)
6
elected(adjective, feature, characteristic, deliberate)
6
witting(adjective, set, direct, keen)
5
uncompelled(adjective, simple, deliberate, natural)
5
willed(adjective, feature, characteristic, deliberate)
4
complimentary(adjective, feature, characteristic, gratis)
4
designful(adjective, feature, characteristic, set, direct)
4
freely(adjective, feature, characteristic, deliberate)
3
facultative(adjective, open, elective, optional)
3
free-willed(adjective, feature, characteristic, deliberate)
2
alternative(open, elective)
2
arbitrary(open, elective)
2
nonobligatory(open, elective)
1
gratis
1
opted(adjective, deliberate, natural, willing)
1
unprescribed(adjective, deliberate, natural, willing)
1
wished(adjective, deliberate, natural, willing)
0
at no charge(expression, idiom, gratis)
0
chargeless(willing, gratis)
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APASmart Define. (2015). voluntary thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/voluntary/thesaurus/synonyms
ChicagoSmart Define. 2015. "voluntary thesaurus" https://smartdefine.org/voluntary/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, voluntary thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/voluntary/thesaurus/synonyms>.
MLASmart Define. "voluntary thesaurus" 14 April 2015. Web. 28 September 2026. <https://smartdefine.org/voluntary/thesaurus/synonyms>