Synonyms|413Antonyms|112|Broader|7Narrower|11Related|520
17
optional(adjective, possible, voluntary, forced)
6
needless
4
extra
4
unnecessary(adjective, required)
3
elective(adjective, able)
3
extracurricular
3
voluntary
2
unessential
2
additional
2
casual
2
extraneous
2
gratuitous
2
inessential
2
nonessential
2
unneeded
1
discretionary
1
dispensable
1
absolute
1
accessorial
1
accessory
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APASmart Define. (2015). required thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/required/thesaurus/antonyms
ChicagoSmart Define. 2015. "required thesaurus" https://smartdefine.org/required/thesaurus/antonyms (accessed September 21, 2026).
HarvardSmart Define 2015, required thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/required/thesaurus/antonyms>.
MLASmart Define. "required thesaurus" 3 November 2015. Web. 21 September 2026. <https://smartdefine.org/required/thesaurus/antonyms>