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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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Antonyms for inefficacious
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Time Traveler for inefficacious
The first known use of inefficacious was in 1658
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