Thesaurus
Synonyms & Antonyms of inefficacious
1
not producing the desired result
- his efforts to restore the neglected houseplant back to health were belated and sadly inefficacious
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Antonyms for inefficacious
2
producing no results
- an inefficacious medication for a rare form of tuberculosis
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“Inefficacious.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/inefficacious. Accessed 17 Sep. 2021.
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The first known use of inefficacious was in 1658
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