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ineffective(adjective, strong, successful)
For more, visit Effectual on Power Thesaurus
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APASmart Define. (2015). effectual thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/effectual/thesaurus/antonyms
ChicagoSmart Define. 2015. "effectual thesaurus" https://smartdefine.org/effectual/thesaurus/antonyms (accessed September 26, 2026).
HarvardSmart Define 2015, effectual thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/effectual/thesaurus/antonyms>.
MLASmart Define. "effectual thesaurus" 13 April 2015. Web. 26 September 2026. <https://smartdefine.org/effectual/thesaurus/antonyms>