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inefficacious

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adjective in·ef·fi·ca·cious \(ˌ)i-ˌne-fə-ˈkā-shəs\

Definition of inefficacious

  1. :  lacking the power to produce a desired effect :  ineffective

in·ef·fi·ca·cious·ly adverb
in·ef·fi·ca·cious·ness noun


Examples of inefficacious

  1. <his efforts to restore the neglected houseplant back to health were belated and sadly inefficacious>

  2. <an inefficacious medication for a rare form of tuberculosis>



1658

First Known Use of inefficacious

1658


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