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
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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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Her 36-year-old NFL star boyfriend was also coming off another season playing for the Kansas City Chiefs, which ended with an unsuccessful campaign for a third consecutive Super Bowl ring.
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However, the efforts were unsuccessful, according to the statement.
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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Perhaps unsurprisingly, subsequent attempts at diplomacy, led by the ailing diplomat and intellectual Benjamin Franklin, also proved ineffective.
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Skunks would rather put up with the strong scent of mothballs than leave a hospitable environment, making mothballs totally ineffective against skunks.
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 6 Jul. 2026.
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