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2
effectual(adjective, influential)
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APASmart Define. (2016). unproductive thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/unproductive/thesaurus/antonyms
ChicagoSmart Define. 2016. "unproductive thesaurus" https://smartdefine.org/unproductive/thesaurus/antonyms (accessed October 1, 2026).
HarvardSmart Define 2016, unproductive thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/unproductive/thesaurus/antonyms>.
MLASmart Define. "unproductive thesaurus" 24 March 2016. Web. 1 October 2026. <https://smartdefine.org/unproductive/thesaurus/antonyms>