Synonyms|29Antonyms|2|Broader|0Narrower|0Related|51

1 entry under optional topic. ×

3
facultative(adjective, open, free, voluntary, elective)
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APASmart Define. (2013). nonobligatory thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/nonobligatory/thesaurus/synonyms
ChicagoSmart Define. 2013. "nonobligatory thesaurus" https://smartdefine.org/nonobligatory/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2013, nonobligatory thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/nonobligatory/thesaurus/synonyms>.
MLASmart Define. "nonobligatory thesaurus" 28 June 2013. Web. 25 September 2026. <https://smartdefine.org/nonobligatory/thesaurus/synonyms>