Obligatory Thesaurus / Antonyms

11	optional
7	voluntary(adjective, willing, involuntary, optional)
6	discretionary
3	unnecessary(adjective, optional)
2	elective
2	nonessential(adjective, optional)
1	dispensable
1	deliberate
1	discretional
1	facultative
1	insignificant
1	needless
1	nonmandatory
1	nonobligatory
1	purposive
1	riveting
1	self-imposed
1	set
1	set about
1	set down

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APA	Smart Define. (2015). obligatory thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/obligatory/thesaurus/antonyms
Chicago	Smart Define. 2015. "obligatory thesaurus" https://smartdefine.org/obligatory/thesaurus/antonyms (accessed September 24, 2026).
Harvard	Smart Define 2015, obligatory thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/obligatory/thesaurus/antonyms>.
MLA	Smart Define. "obligatory thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/obligatory/thesaurus/antonyms>

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