Dictionary

inefficacious

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

Definition of INEFFICACIOUS

:  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>

First Known Use of INEFFICACIOUS

1658

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