1
as in unsuccessful
not producing the desired result
his efforts to restore the neglected houseplant back to health were belated and sadly inefficacious
Synonyms & Similar Words
Relevance
Antonyms & Near Antonyms
2
as in futile
producing no results
an inefficacious medication for a rare form of tuberculosis
Synonyms & Similar Words
Antonyms & Near Antonyms
Example Sentences
Recent Examples of Synonyms for inefficacious
Adjective
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More than a decade ago, her association sought the same change at the federal level and was unsuccessful — opposed at the time by Wine Institute.
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The city had taken it over, but several attempts at renovation were unsuccessful, until Alan Leventhal, chief executive of Beacon Capital Partners, happened to see the building and envisioned it as a great hotel.
Adjective
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Exciting and futile The Humans to Titan Summit was both exciting and futile, said Pascal Lee, chairman of the Mars Institute and a planetary scientist at the SETI Institute.
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All these plans acknowledge the experience gap, namely that training without arranging relevant work experience is often futile.
Adjective
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When operations are inefficient or inconsistent because the underlying tech can’t keep up, customers quickly get frustrated.
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Clicking on a task opens it up in a dedicated page, which is a remarkably inefficient use of space.
Adjective
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At any rate, upon election my first official act would be to file legislation to do away with the useless job.
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An ultra-secure cloud environment is useless if the identity management policy is lax or if access privileges are not reviewed on a strict need-to-know basis.
Adjective
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Conventional interventions have been largely ineffective, suggesting a rate increase may be the strongest tool left for policymakers to stabilize the won.
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While some viral health trends are harmless—or simply ineffective—others can put your health at serious risk.
Adjective
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In his letter, Leo repeated the Vatican's offer of dialogue and said that going through with the consecrations would be counterproductive for the SSPX faithful.
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This sophisticated system prevents metabolically expensive and functionally counterproductive perpetual growth, ensuring hair serves specific protective and insulating roles.
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Cite this Entry
“Inefficacious.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/inefficacious. Accessed 5 Jul. 2026.
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