Synonyms|254Antonyms|75|Broader|10Narrower|4Related|423
15
optional
7
voluntary
4
unnecessary
4
unforced
3
discretionary
3
not needed(expression, adjective, state, need, obligation)
3
not obligatory(expression, adjective, idiom, state, need)
1
elective
1
tolerable
1
adventitious
1
arbitrary
1
banned
1
incipient
1
intentional
1
volitional
1
volunteer
0
set down
0
unneeded
0
willing
0
accidental
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APASmart Define. (2015). mandatory thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/mandatory/thesaurus/antonyms
ChicagoSmart Define. 2015. "mandatory thesaurus" https://smartdefine.org/mandatory/thesaurus/antonyms (accessed September 22, 2026).
HarvardSmart Define 2015, mandatory thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/mandatory/thesaurus/antonyms>.
MLASmart Define. "mandatory thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/mandatory/thesaurus/antonyms>