Synonyms|48Antonyms|0|Broader|0Narrower|0Related|0
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feeble(inadequate, limited, useless, vain, unsuccessful)
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hopeless(useless, vain, unsuccessful)
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inadequate(limited, feeble, useless, vain, unsuccessful)
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inefficacious(inadequate, feeble, useless, unpolluted, vain)
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limited(inadequate, feeble, useless, vain, unsuccessful)
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unsuccessful(inadequate, limited, feeble, useless, vain)
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useless(inadequate, feeble, vain, unsuccessful)
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vain(inadequate, limited, feeble, useless, unsuccessful)
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APASmart Define. (2013). not effective thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/not_effective/thesaurus/synonyms
ChicagoSmart Define. 2013. "not effective thesaurus" https://smartdefine.org/not_effective/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2013, not effective thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/not_effective/thesaurus/synonyms>.
MLASmart Define. "not effective thesaurus" 18 May 2013. Web. 23 September 2026. <https://smartdefine.org/not_effective/thesaurus/synonyms>