Synonyms|338Antonyms|89|Broader|3Narrower|0Related|358
16
optional(adjective, possible, forced)
7
voluntary
6
elective
5
unnecessary
4
discretionary
4
free(adjective, optional)
3
volitional
3
willful
2
deliberate
2
dispensable
2
liberalized(adjective, optional)
2
unneeded
2
unstipulated
2
willing
2
set free
2
willing and able
1
peaceful
1
unforced
1
accountable
1
additional
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APASmart Define. (2015). compulsory thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/compulsory/thesaurus/antonyms
ChicagoSmart Define. 2015. "compulsory thesaurus" https://smartdefine.org/compulsory/thesaurus/antonyms (accessed September 20, 2026).
HarvardSmart Define 2015, compulsory thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/compulsory/thesaurus/antonyms>.
MLASmart Define. "compulsory thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/compulsory/thesaurus/antonyms>