Synonyms|563Antonyms|84|Broader|7Narrower|17Related|163
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helplessness
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hopelessness
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idleness(noun, weakness, ineffectiveness)
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impotency
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inadequateness
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inanity
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inconclusiveness
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inconvenience
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inefficaciousness
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inefficacy
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ineptness
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inexpediency
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injury
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insufficiency
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invalidity
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lethargy(noun, weakness, ineffectiveness)
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maladroitness
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malfunction
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persuade
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pianissimo
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APASmart Define. (2016). effectiveness thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/effectiveness/thesaurus/antonyms
ChicagoSmart Define. 2016. "effectiveness thesaurus" https://smartdefine.org/effectiveness/thesaurus/antonyms (accessed September 22, 2026).
HarvardSmart Define 2016, effectiveness thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/effectiveness/thesaurus/antonyms>.
MLASmart Define. "effectiveness thesaurus" 25 February 2016. Web. 22 September 2026. <https://smartdefine.org/effectiveness/thesaurus/antonyms>