Inefficacious and Usable

Opposite meaning words

Inefficacious adjective - Producing no results.

Usage example: an inefficacious medication for a rare form of tuberculosis

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Usable is an antonym for inefficacious.

Usable adjective - Capable of or suitable for being used for a particular purpose.

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Inefficacious is an antonym for usable.

Nearby Words: usability, usably

Cite this Source

Usable and Inefficacious. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/inefficacious/usable

Inefficacious & Usable. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/inefficacious/usable>.

Usable or Inefficacious. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/inefficacious/usable.

Google Ngram Viewer shows how "inefficacious" and "usable" have occurred on timeline