Be efficacious antonyms

What is the opposite word for Be efficacious?

Antonyms for be efficacious

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Antonyms for Be efficacious. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/antonyms/be_efficacious

Antonyms for Be efficacious. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/antonyms/be_efficacious>.

Antonyms for Be efficacious. 2016. Accessed August 15, 2026. https://thesaurus.plus/antonyms/be_efficacious.