Antonyms for efficacious
ˌɛf ɪˈkeɪ ʃəsef·fi·ca·cious

Princeton's WordNetRate these antonyms:0.0 / 0 votes

1. efficaciousadjective

   marked by qualities giving the power to produce an intended effect

   "written propaganda is less efficacious than the habits and prejudices...of the readers"-Aldous Huxley; "the medicine is efficacious in stopping a cough"

   Antonyms:
   inefficacious

   Synonyms:
   effectual, effective

2. effective, effectual, efficaciousadjective

   producing or capable of producing an intended result or having a striking effect

   "an air-cooled motor was more effective than a witch's broomstick for rapid long-distance transportation"-LewisMumford; "effective teaching methods"; "effective steps toward peace"; "made an effective entrance"; "his complaint proved to be effectual in bringing action"; "an efficacious law"

   Antonyms:
   inefficacious

   Synonyms:
   sound, effective, in effect(p), efficient, effectual, legal, in force(p), good

Synonyms, Antonyms & Associated WordsRate these synonyms:0.0 / 0 votes

1. efficaciousadjective

   Antonyms:
   inefficacious

   Synonyms:
   potent, effectual, effective, productive

How to use efficacious in a sentence?

1. Don Sodora:

   It's still being tested, merck is still trying to figure out how efficacious it is, but it can really provide an opportunity where you can start protecting people.

2. Gregory Poland:

   This is important, but it has to be done in a way that reassures scientists and the public that these (vaccines) are not only efficacious, but safe.

3. Nora Volkow:

   One of the things is, we don't have any evidence-based medication that has proven to be efficacious for the treatment of cocaine addiction, so we currently have no medicine to intervene, and it can be a very severe addiction and actually quite dangerous.

4. Anthony Fauci:

   When the American public hears that, you should be assured that that is the case and if you get an overwhelming majority of the people vaccinated with a highly efficacious vaccine, we can reasonably quickly get into herd immunity that would be a blanket of protection for the country.

5. Anthony Fauci:

   If you have a highly efficacious vaccine, and only a relatively small 40, 50 % of the people get vaccinated, you're not going to get the herd immunity you need, what we do need is we need to get as many people as possible vaccinated.

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