intermediate Level
Efficacy
The ability to produce a desired or intended result.
✓ Synonyms
Effectivenesssuccesspotencypower
✗ Antonyms
Inefficacyfailure
About "Efficacy"
Efficacy is a vocabulary word commonly tested on the SAT. Understanding this word and its synonyms (Effectiveness, success) can help you answer Reading and Writing questions more accurately. The opposite meaning (antonyms) includes words like Inefficacy and failure..
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