15 entries under adjective topic. ×

4
discretionary(open, free, voluntary, elective)
4
nonmandatory
4
optional(possible, voluntary, elective, electoral)
3
elective(open, free, able, voluntary)
3
facultative(open, free, voluntary, elective)
2
voluntary(open, free, elective, electoral)
1
arbitrary(open, free, voluntary, elective)
1
discretional(open, free, voluntary, elective)
1
electoral
1
possible(voluntary, elective)
0
constituent
0
eligible
0
not compulsory(expression, electoral)
0
selective
0
voting
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APASmart Define. (2013). nonobligatory thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/nonobligatory/thesaurus/synonyms
ChicagoSmart Define. 2013. "nonobligatory thesaurus" https://smartdefine.org/nonobligatory/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2013, nonobligatory thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/nonobligatory/thesaurus/synonyms>.
MLASmart Define. "nonobligatory thesaurus" 28 June 2013. Web. 27 September 2026. <https://smartdefine.org/nonobligatory/thesaurus/synonyms>