efficacious

adjective

ef·fi·ca·cious ˌe-fə-ˈkā-shəs How to pronounce efficacious (audio)

: having the power to produce a desired effect

an efficacious remedy

efficaciously adverb

efficaciousness noun

Did you know?

Effective, effectual, and efficient are synonyms of efficacious, but each of these words has a slightly different connotation. Efficacious suggests possession of a special quality or virtue that makes it possible to achieve a result ("a detergent that is efficacious in removing grease"). Effective stresses the power to produce or the actual production of a particular effect ("an effective rebuttal"), while effectual suggests the accomplishment of a desired result, especially as viewed after the fact ("measures taken to reduce underage drinking have proved effectual"). The last synonym, efficient, implies an acting or potential for acting that avoids loss or waste of energy ("an efficient small car").

Example Sentences

taking a cookie break while studying is one of the most efficacious ways of rejuvenating the mind that I have ever discovered

Recent Examples on the Web Over decades, UFAs have demonstrated their value by accelerating patients’ access to safe and efficacious medicines.

Wayne Winegarden, Forbes, 15 June 2022 Seriously, who can say no to efficacious clean concealers and foundations?

Kiana Murden, Vogue, 13 June 2022 Conversations on access and successfully treating psychiatric diagnoses often return to the question of efficacious medicines.

Kathleen Frazier, Variety, 20 May 2022 Though the idea of the best clean concealers might conjure up depictions of serum-like dewy makeup formulas, Lawless’s concealer proves that even skin-friendly offerings can deliver an efficacious matte finish.

Kiana Murden, Vogue, 18 May 2022 L'Occitane Known for botanical scents and pampering textures, L'Occitane's skincare and haircare products have also been multiple time GH Sustainability Award winners for their efficacious formulations and thoughtful, minimal waste packaging.

April Franzino, Good Housekeeping, 28 Apr. 2022 The two-dose regimen didn’t prove as efficacious in protecting the youngest children from infection and disease, especially against the Omicron variant, as health officials had hoped.

Alice Park, Time, 23 Mar. 2022 The cutting-edge Swiss skincare brand is famous for their impressively efficacious formulas and this assortment turns back the clock in style.

Celia Shatzman, Forbes, 5 Nov. 2021 Because mRNA vaccines like Pfizer and Moderna need to be kept cold and their global supply is sparse, medical authorities instead used less efficacious but easier to transport vaccines like Sinovac, Johnson & Johnson and AstraZeneca.

USA Today, 20 Mar. 2022 See More

efficacious

adjective

as in efficient

producing or capable of producing a desired result taking a cookie break while studying is one of the most efficacious ways of rejuvenating the mind that I have ever discovered

Synonyms & Similar Words

Relevance

efficient
effective
potent
productive
effectual
adequate
fruitful
operative
useful
capable
practical
practiced
convincing
adept
proficient
skilled
competent
feasible
expert
experienced
practicable
skillful
cogent
accomplished
valid
practised
realizable
active
masterly
dynamic
hyperefficient
striking
workable
telling
veteran
useable
versed
ultraefficient
functional
usable
virtuoso
killer
applicable
sound
consummate
working

Antonyms & Near Antonyms

ineffective
useless
inefficient
ineffectual
incapable
fruitless
inoperative
unproductive
counterproductive
incompetent
futile
inexperienced
unskilled
vain
unsuccessful
unqualified
unfruitful
abortive
unprofitable
hollow
worthless
empty
pointless
idle
inexpert
unskillful
inoperative
unavailing
unseasoned
bootless

Synonym Chooser

Some common synonyms of efficacious are effective, effectual, and efficient. While all these words mean "producing or capable of producing a result," efficacious suggests possession of a special quality or virtue that gives effective power.

a detergent that is efficacious in removing grease

In some situations, the words effective and efficacious are roughly equivalent. However, effective stresses the actual production of or the power to produce an effect.

an effective rebuttal

Although the words effectual and efficacious have much in common, effectual suggests the accomplishment of a desired result especially as viewed after the fact.

the measures to stop the pilfering proved effectual

While the synonyms efficient and efficacious are close in meaning, efficient suggests an acting or a potential for action or use in such a way as to avoid loss or waste of energy in effecting, producing, or functioning.

an efficient small car

单词	efficacious
释义	efficacious adjective ef·fi·ca·cious ˌe-fə-ˈkā-shəs : having the power to produce a desired effect an efficacious remedy efficaciously adverb efficaciousness noun Did you know? Effective, effectual, and efficient are synonyms of efficacious, but each of these words has a slightly different connotation. Efficacious suggests possession of a special quality or virtue that makes it possible to achieve a result ("a detergent that is efficacious in removing grease"). Effective stresses the power to produce or the actual production of a particular effect ("an effective rebuttal"), while effectual suggests the accomplishment of a desired result, especially as viewed after the fact ("measures taken to reduce underage drinking have proved effectual"). The last synonym, efficient, implies an acting or potential for acting that avoids loss or waste of energy ("an efficient small car"). Synonyms effective effectual efficient fruitful operative potent productive See all Synonyms & Antonyms Example Sentences taking a cookie break while studying is one of the most efficacious ways of rejuvenating the mind that I have ever discovered Recent Examples on the Web Over decades, UFAs have demonstrated their value by accelerating patients’ access to safe and efficacious medicines. Wayne Winegarden, Forbes, 15 June 2022 Seriously, who can say no to efficacious clean concealers and foundations? Kiana Murden, Vogue, 13 June 2022 Conversations on access and successfully treating psychiatric diagnoses often return to the question of efficacious medicines. Kathleen Frazier, Variety, 20 May 2022 Though the idea of the best clean concealers might conjure up depictions of serum-like dewy makeup formulas, Lawless’s concealer proves that even skin-friendly offerings can deliver an efficacious matte finish. Kiana Murden, Vogue, 18 May 2022 L'Occitane Known for botanical scents and pampering textures, L'Occitane's skincare and haircare products have also been multiple time GH Sustainability Award winners for their efficacious formulations and thoughtful, minimal waste packaging. April Franzino, Good Housekeeping, 28 Apr. 2022 The two-dose regimen didn’t prove as efficacious in protecting the youngest children from infection and disease, especially against the Omicron variant, as health officials had hoped. Alice Park, Time, 23 Mar. 2022 The cutting-edge Swiss skincare brand is famous for their impressively efficacious formulas and this assortment turns back the clock in style. Celia Shatzman, Forbes, 5 Nov. 2021 Because mRNA vaccines like Pfizer and Moderna need to be kept cold and their global supply is sparse, medical authorities instead used less efficacious but easier to transport vaccines like Sinovac, Johnson & Johnson and AstraZeneca. USA Today, 20 Mar. 2022 See More Word History Etymology borrowed from Middle French efficace "effective" or its source Latin efficāc-, efficāx "capable of fulfilling a function, effective" (from efficere "to make, bring about, produce, carry out" + -āc-, -āx, deverbal suffix denoting habitual or successful performance) + -ious — more at effect entry 1, audacious First Known Use 1528, in the meaning defined above efficacious adjective as in efficient producing or capable of producing a desired result taking a cookie break while studying is one of the most efficacious ways of rejuvenating the mind that I have ever discovered Synonyms & Similar Words Relevance efficient effective potent productive effectual adequate fruitful operative useful capable practical practiced convincing adept proficient skilled competent feasible expert experienced practicable skillful cogent accomplished valid practised realizable active masterly dynamic hyperefficient striking workable telling veteran useable versed ultraefficient functional usable virtuoso killer applicable sound consummate working Antonyms & Near Antonyms ineffective useless inefficient ineffectual incapable fruitless inoperative unproductive counterproductive incompetent futile inexperienced unskilled vain unsuccessful unqualified unfruitful abortive unprofitable hollow worthless empty pointless idle inexpert unskillful inoperative unavailing unseasoned bootless See More Synonym Chooser Some common synonyms of efficacious are effective, effectual, and efficient. While all these words mean "producing or capable of producing a result," efficacious suggests possession of a special quality or virtue that gives effective power. a detergent that is efficacious in removing grease In some situations, the words effective and efficacious are roughly equivalent. However, effective stresses the actual production of or the power to produce an effect. an effective rebuttal Although the words effectual and efficacious have much in common, effectual suggests the accomplishment of a desired result especially as viewed after the fact. the measures to stop the pilfering proved effectual While the synonyms efficient and efficacious are close in meaning, efficient suggests an acting or a potential for action or use in such a way as to avoid loss or waste of energy in effecting, producing, or functioning. an efficient small car
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efficacious

adjective

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Synonyms

Example Sentences

Word History

adjective

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