16 entries under open topic. ×

15
voluntary(adjective, feature, characteristic, free)
10
unforced(adjective, feature, characteristic, free)
5
free(adjective, feature, characteristic, deliberate)
4
discretional(adjective, feature, characteristic, free)
3
discretionary(free, will, voluntary, elective)
2
alternative(free, voluntary, elective)
2
elective(free, voluntary)
1
facultative(adjective, free, voluntary, elective)
0
arbitrary(free, voluntary, elective)
0
extra(free, voluntary, elective)
0
no strings attached(expression, idiom, free, voluntary)
0
noncompulsory(free, voluntary, elective)
0
nonobligatory(free, voluntary, elective)
0
not required(expression, free, voluntary, elective)
0
unrestricted(free, voluntary, elective)
0
up to the individual(expression, idiom, free, voluntary)
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APASmart Define. (2015). volitional thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/volitional/thesaurus/synonyms
ChicagoSmart Define. 2015. "volitional thesaurus" https://smartdefine.org/volitional/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, volitional thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/volitional/thesaurus/synonyms>.
MLASmart Define. "volitional thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/volitional/thesaurus/synonyms>