Synonyms|86Antonyms|28|Broader|0Narrower|1Related|90
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eventual
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extra(open, free, voluntary, elective)
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facilitative
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fair
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favourable
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fitting
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fluke
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foreseen
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halophile
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helpful
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helping
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incidental
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methanogen
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microaerophile
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microbe
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no strings attached(expression, idiom, open, free, voluntary)
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non-compulsory
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non-mandatory
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non-requisite
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not obligatory(expression, idiom)
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APASmart Define. (2013). facultative thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/facultative/thesaurus/synonyms
ChicagoSmart Define. 2013. "facultative thesaurus" https://smartdefine.org/facultative/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2013, facultative thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/facultative/thesaurus/synonyms>.
MLASmart Define. "facultative thesaurus" 28 June 2013. Web. 22 September 2026. <https://smartdefine.org/facultative/thesaurus/synonyms>