Efficacious and Impotent

Opposite meaning words

Efficacious adjective - Producing or capable of producing a desired result.

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Impotent is an antonym for efficacious in efficient topic.

Impotent adjective - Lacking power or ability.

Usage example: "morality without technology is impotent"- Freeman J.Dyson

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Efficacious is an antonym for impotent.

Nearby Word: impotence

Cite this Source

Impotent and Efficacious. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/efficacious/impotent

Efficacious & Impotent. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/efficacious/impotent>.

Impotent or Efficacious. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/efficacious/impotent.

Google Ngram Viewer shows how "efficacious" and "impotent" have occurred on timeline