Efficacious
Efficacious adjective - Producing or capable of producing a desired result.
Happy and efficacious are semantically related In some cases you can use "Happy" instead an adjective "Efficacious".
Happy
Happy adjective - Coming or happening by good luck especially unexpectedly.
Efficacious and happy are semantically related in lucky topic. Sometimes you can use "Efficacious" instead an adjective "Happy".
Mutual synonyms
Cite this Source
Happy and Efficacious. (2016). Retrieved 2026, August 07, from https://thesaurus.plus/related/efficacious/happy
Efficacious & Happy. N.p., 2016. Web. 07 Aug. 2026. <https://thesaurus.plus/related/efficacious/happy>.
Happy or Efficacious. 2016. Accessed August 07, 2026. https://thesaurus.plus/related/efficacious/happy.
Google Ngram Viewer shows how "efficacious" and "happy" have occurred on timeline