Synonyms|222Antonyms|126|Broader|3Narrower|0Related|351
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impertinent(unwarranted, unjustified, undeserved)
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inappropriate(adjective, useless, unwarranted, unnecessary, unjustified)
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indecorous(unwarranted, unjustified, undeserved)
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indefensible(unwarranted, unjustified, undeserved)
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inexcusable(unwarranted, unjustified, undeserved)
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intercollegiate
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interscholastic
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interschool
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judge and jury
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judgmental(adjective, arbitrary)
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natural(spontaneous, voluntary)
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non-compulsory
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non-mandatory
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non-requisite
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not mandatory
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not obligatory(expression, idiom)
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open-ended
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options
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possible(adjective, voluntary, elective)
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public
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APASmart Define. (2015). optional thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/optional/thesaurus/synonyms
ChicagoSmart Define. 2015. "optional thesaurus" https://smartdefine.org/optional/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, optional thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/optional/thesaurus/synonyms>.
MLASmart Define. "optional thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/optional/thesaurus/synonyms>