Efficacious and Feckless

Opposite meaning words

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

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Feckless is an antonym for efficacious.

Feckless adjective - Not producing the desired result.

Usage example: a well-intentioned but feckless response to the rise in school violence

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Efficacious is an antonym for feckless.

Nearby Word: feck

Cite this Source

Feckless and Efficacious. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/efficacious/feckless

Efficacious & Feckless. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/efficacious/feckless>.

Feckless or Efficacious. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/efficacious/feckless.

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