Efficacious and Unfailing

Efficacious

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

Unfailing and efficacious are semantically related. In some cases you can use "Unfailing" instead an adjective "Efficacious".

Unfailing

Unfailing adjective - Not being or likely to be wrong.

Efficacious and unfailing are semantically related. Sometimes you can use "Efficacious" instead an adjective "Unfailing".

Nearby Word: unfailingly
Cite this Source
Unfailing and Efficacious. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/efficacious/unfailing
Efficacious & Unfailing. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/efficacious/unfailing>.
Unfailing or Efficacious. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/efficacious/unfailing.
Google Ngram Viewer shows how "efficacious" and "unfailing" have occurred on timeline