Futile and Inefficacious

Futile

Futile adjective - Producing no results.
Usage example: the prison is so well guarded that all attempts to escape have been futile

Inefficacious is a synonym for futile in useless topic. In some cases you can use "Inefficacious" instead an adjective "Futile", when it comes to topics like ineffectual.

Nearby Word: futility

Inefficacious

Inefficacious adjective - Not producing the desired result.
Usage example: his efforts to restore the neglected houseplant back to health were belated and sadly inefficacious

Futile is a synonym for inefficacious in ineffectual topic. You can use "Futile" instead an adjective "Inefficacious", if it concerns topics such as ineffective.
Cite this Source
Inefficacious and Futile. (2016). Retrieved 2026, August 02, from https://thesaurus.plus/related/futile/inefficacious
Futile & Inefficacious. N.p., 2016. Web. 02 Aug. 2026. <https://thesaurus.plus/related/futile/inefficacious>.
Inefficacious or Futile. 2016. Accessed August 02, 2026. https://thesaurus.plus/related/futile/inefficacious.
Google Ngram Viewer shows how "futile" and "inefficacious" have occurred on timeline