inefficacious

adjective

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

How to pronounce inefficacious (audio)

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Definition of inefficacious

: lacking the power to produce a desired effect : ineffective

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Examples of inefficacious in a Sentence

his efforts to restore the neglected houseplant back to health were belated and sadly inefficacious an inefficacious medication for a rare form of tuberculosis

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The first known use of inefficacious was in 1658

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