Inability and Inefficacy

Inability

Inability noun - The lack of sufficient ability, power, or means.
Usage example: the apparent inability of young children to sit still

Inefficacy is a synonym for inability in skill topic. In some cases you can use "Inefficacy" instead a noun "Inability", when it comes to topics like incompetence.

Inefficacy

Inefficacy noun - A lack of efficacy.
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Synonyms for Inefficacy

Inability is a synonym for inefficacy. You can use "Inability" instead a noun "Inefficacy".
Cite this Source
Inefficacy and Inability. (2016). Retrieved 2026, August 01, from https://thesaurus.plus/related/inability/inefficacy
Inability & Inefficacy. N.p., 2016. Web. 01 Aug. 2026. <https://thesaurus.plus/related/inability/inefficacy>.
Inefficacy or Inability. 2016. Accessed August 01, 2026. https://thesaurus.plus/related/inability/inefficacy.
Google Ngram Viewer shows how "inability" and "inefficacy" have occurred on timeline