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1
efficient(adjective, effective)
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APASmart Define. (2015). powerless thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/powerless/thesaurus/antonyms
ChicagoSmart Define. 2015. "powerless thesaurus" https://smartdefine.org/powerless/thesaurus/antonyms (accessed September 25, 2026).
HarvardSmart Define 2015, powerless thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/powerless/thesaurus/antonyms>.
MLASmart Define. "powerless thesaurus" 4 November 2015. Web. 25 September 2026. <https://smartdefine.org/powerless/thesaurus/antonyms>