Synonyms for efficacy
ˈɛf ɪ kə sief·fi·ca·cy

WiktionaryRate these synonyms:0.0 / 0 votes

1. efficacynoun

   Synonyms:
   efficacity

2. efficacynoun

   Ability to produce a desired amount of a desired effect.

   Synonyms:
   efficacity

English Synonyms and AntonymsRate these synonyms:3.6 / 5 votes

1. efficacy

   Power is the most general term of this group, including every quality, property, or faculty by which any change, effect, or result is, or may be, produced; as, the power of the legislature to enact laws, or of the executive to enforce them; the power of an acid to corrode a metal; the power of a polished surface to reflect light. Ability is nearly coextensive with power, but does not reach the positiveness and vigor that may be included in the meaning of power, ability often implying latent, as distinguished from active power; we speak of an exertion of power, but not of an exertion of ability. Power and ability include capacity, which is power to receive; but ability is often distinguished from capacity, as power that may be manifested in doing, as capacity is in receiving; one may have great capacity for acquiring knowledge, and yet not possess ability to teach. Efficiency is active power to effect a definite result, the power that actually does, as distinguished from that which may do. Competency is equal to the occasion, readiness prompt for the occasion. Faculty is an inherent quality of mind or body; talent, some special mental ability. Dexterity and skill are readiness and facility in action, having a special end; talent is innate, dexterity and skill are largely acquired. Our abilities include our natural capacity, faculties, and talents, with all the dexterity, skill, and readiness that can be acquired. Efficacy is the power to produce an intended effect as shown in the production of it; as, the efficacy of a drug. Efficiency is effectual agency, competent power; efficiency is applied in mechanics as denoting the ratio of the effect produced to the power expended in producing it; but this word is chiefly used of intelligent agents as denoting the quality that brings all one's power to bear promptly and to the best purpose on the thing to be done. Compare ADDRESS; DEXTERITY; SKILFUL.

   Synonyms:
   ability, aptitude, capability, capacity, cleverness, cogency, competency, dexterity, efficiency, energy, expertness, faculty, force, might, power, qualification, readiness, skill, strength, susceptibility, talent

   Antonyms:
   awkwardness, dulness, feebleness, helplessness, imbecility, impotence, inability, inaptitude, incapacity, incompetence, inefficiency, maladroitness, stupidity, unskilfulness, weakness

Complete Dictionary of Synonyms and AntonymsRate these synonyms:0.0 / 0 votes

1. efficacy

   Synonyms:
   efficiency, competency, virtue, agency, capability, usefulness, energy, productiveness, effectiveness

   Antonyms:
   inefficiency, inutility, ineffectiveness

Princeton's WordNetRate this synonym:1.0 / 1 vote

1. efficacy, efficaciousnessnoun

   capacity or power to produce a desired effect

   "concern about the safety and efficacy of the vaccine"

   Synonyms:
   efficaciousness

   Antonyms:
   inefficaciousness, inefficacy

Matched Categories

1. • Effectiveness

Editors ContributionRate these synonyms:0.0 / 0 votes

1. capable

   able to do

   Submitted by rinat on August 15, 2019  

Dictionary of English SynonymesRate these synonyms:0.0 / 0 votes

1. efficacynoun

   Synonyms:
   potency, competency, power, strength, force, efficiency

Synonyms, Antonyms & Associated WordsRate these synonyms:5.0 / 1 vote

1. efficacynoun

   Synonyms:
   potency, effectiveness, efficiency, productiveness

   Antonyms:
   inefficacy, impotency

PPDB, the paraphrase databaseRate these paraphrases:0.0 / 0 votes

1. List of paraphrases for "efficacy":

   effectiveness, efficiency, effective, efficient, efficiencies

Suggested Resources

1. Efficacy

   Efficacy vs. Efficiency -- In this Grammar.com article you will learn the differences between the words Efficacy and Efficiency.

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How to use efficacy in a sentence?

1. Paul Offit:

   I think from the standpoint of the public, it really shouldn't matter, it's been given to half of the American population. We have more than 300 million doses out there. This is far from experimental. We have a tremendous safety and efficacy portfolio on these vaccines -- I mean, it's more than most licensed products that are out there now.

2. Ron DeSantis:

   We rejected the elites, and we were right, not only were they wrong about [closing] schools, the elites were wrong about lockdowns, they were wrong about epidemiological models and hospitalization models, they were wrong about forced masking, they were wrong when they rejected the existence of natural immunity, they were wrong about the efficacy of the mRNA vaccines, and they were wrong when – and I said this – that COVID was seasonal, and now they admit it.

3. Anthony Fauci:

   You never want to get ahead of the FDA in their regulatory decisions, nor do you want to get ahead of the CDC and their advisers on what the recommended would be, but if you look at the data that's been made public and announced by the company, the data looked good as to the efficacy and the safety.

4. Michael Bars:

   The recent announcements by Pfizer and Moderna regarding their incredibly promising and impressive efficacy data further demonstrate that the Warp Speed Program is rapidly advancing on a trajectory of success to the benefit of millions of at-risk Americans.

5. Lisa Dabney:

   Pregnancy cannot happen if there is no egg to join with sperm, it has been shown to have some efficacy at three days, but the sooner you take it the better.