Synonyms|56Antonyms|2|Broader|0Narrower|0Related|27
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inessential(adjective, unnecessary)
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needless
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odd
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open(adjective, free, voluntary, elective)
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possible(adjective, voluntary, elective)
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random
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redundant
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singular
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spare
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strange
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superfluous
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supplementary
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uncalled for(expression, casual)
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uncompelled(adjective, voluntary, elective)
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unrequired(adjective, unnecessary)
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unrestricted(adjective, open, free, voluntary, elective)
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APASmart Define. (2013). noncompulsory thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/noncompulsory/thesaurus/synonyms
ChicagoSmart Define. 2013. "noncompulsory thesaurus" https://smartdefine.org/noncompulsory/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2013, noncompulsory thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/noncompulsory/thesaurus/synonyms>.
MLASmart Define. "noncompulsory thesaurus" 17 June 2013. Web. 22 September 2026. <https://smartdefine.org/noncompulsory/thesaurus/synonyms>