What's the difference between
and
Enter two words to compare and contrast their definitions, origins, and synonyms to better understand how those words are related.

Efficacy vs Successful - What's the difference?

efficacy | successful |

As a noun efficacy

is ability to produce a desired amount of a desired effect.

As an adjective successful is

resulting in success; assuring, or promotive of, success; accomplishing what was proposed; having the desired effect; prosperous; fortunate; happy.

efficacy

English

Noun

(-)
  • (uncountable) Ability to produce a desired amount of a desired effect.

    • Synonyms

    * efficacity

    Related terms

    * effect * effective * effectiveness * effectivity * effector * effectual * effectuate * efficacious * efficacity * efficiency * efficient

    External links

    * *

    successful

    English

    Adjective

    (en adjective)
  • Resulting in success; assuring, or promotive of, success; accomplishing what was proposed; having the desired effect; prosperous; fortunate; happy
  • * {{quote-book, year=2006, author=(Edwin Black), title=Internal Combustion
    • , chapter=1 citation , passage=If successful , Edison and Ford—in 1914—would move society away from the ever more expensive and then universally known killing hazards of gasoline cars: […] .}}
  • * {{quote-magazine, date=2013-06-21, author=(Oliver Burkeman)
    • , volume=189, issue=2, page=27, magazine=(The Guardian Weekly) , title= The tao of tech , passage=The dirty secret of the internet is that all this distraction and interruption is immensely profitable. Web companies like to boast about […], or offering services that let you

    Synonyms

    * efficacious, effective, fruitful, rewarding, accomplished, profitable

    Antonyms

    * unsuccessful * failed

    Derived terms

    * successfully * successfulness

    Related terms

    * success