16 entries under open topic. ×

14
voluntary(adjective, free, able)
14
discretionary(adjective, free, fit, choice)
8
facultative(adjective, free, choice, able)
7
alternative(adjective, free, voluntary, optional)
7
discretional(adjective, free, voluntary, optional)
7
free(adjective, voluntary)
7
unforced(adjective, free, voluntary)
2
arbitrary(adjective, free, voluntary)
2
nonobligatory(adjective, free, able, voluntary)
2
volitional(adjective, free, voluntary)
1
no strings attached(expression, adjective, idiom, free)
1
noncompulsory(adjective, free, voluntary)
1
not required(expression, adjective, free, voluntary)
1
unrestricted(adjective, free, voluntary)
1
up to the individual(expression, adjective, idiom, free)
0
extra(adjective, free, voluntary)
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APASmart Define. (2015). elective thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/elective/thesaurus/synonyms
ChicagoSmart Define. 2015. "elective thesaurus" https://smartdefine.org/elective/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, elective thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/elective/thesaurus/synonyms>.
MLASmart Define. "elective thesaurus" 10 April 2015. Web. 21 September 2026. <https://smartdefine.org/elective/thesaurus/synonyms>