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ineffective(adjective, useless, unpolluted, vain, unsuccessful)
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inefficacious(inadequate, feeble, useless, unpolluted, vain)
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APASmart Define. (2013). not effective thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/not_effective/thesaurus/synonyms
ChicagoSmart Define. 2013. "not effective thesaurus" https://smartdefine.org/not_effective/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2013, not effective thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/not_effective/thesaurus/synonyms>.
MLASmart Define. "not effective thesaurus" 18 May 2013. Web. 24 September 2026. <https://smartdefine.org/not_effective/thesaurus/synonyms>