Antonyms 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.

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

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

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

1. efficacy

   Antonyms:
   inefficiency, inutility, ineffectiveness

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

Matched Categories

1. • Effectiveness

Princeton's WordNetRate this antonym:1.0 / 1 vote

1. efficacy, efficaciousnessnoun

   capacity or power to produce a desired effect

   "concern about the safety and efficacy of the vaccine"

   Antonyms:
   inefficaciousness, inefficacy

   Synonyms:
   efficaciousness

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

1. efficacynoun

   Antonyms:
   inefficacy, impotency

   Synonyms:
   potency, effectiveness, efficiency, productiveness

How to use efficacy in a sentence?

1. Vasee Moorthy:

   Congo Ebola outbreak's clearly very difficult to evaluate efficacy of Ebola products in outbreaks.

2. Adam Moeser:

   It is possible that compounds that failed to make it to the market due to failure of efficacy in the preclinical animals research stages, could have been effective therapies in women, or vice versa.

3. Taro Kono:

   I think it is more important for the Japanese government to show the Japanese people that we have done everything possible to prove the efficacy and safety of the vaccine to encourage the Japanese people to take the vaccine, so at the end of the day we might have started slower, but we think it will be more effective. Half of the recipients of the first shots will keep daily records of their condition for seven weeks ; that data will be used in a health study meant to inform people worried about the side effects. Studies on tens of thousands of people of the Pfizer vaccine — and others being administered currently in other countries — have found no serious side effects.

4. Catherine Andersen:

   I'm not entirely sure why vaccine efficacy in this population hasn't been more well reported, it's a missed opportunity for greater public health intervention.

5. Brian Greenwood:

   Given that there were an estimated 198 million malaria cases in 2013, this level of efficacy potentially translates into millions of cases of malaria in children being prevented.

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