What context can I use each word in?
Learn when and how to use these words with these examples!
efficacy
Example
The efficacy of this new drug has been proven in clinical trials. [efficacy: noun]
Example
The efficacy of this teaching method has been demonstrated in improving student performance. [efficacy: noun]
usefulness
Example
This tool has great usefulness in completing this task efficiently. [usefulness: noun]
Example
The information provided in this book is of great usefulness to students studying this subject. [usefulness: noun]
Good things to know
Which word is more common?
Usefulness is more commonly used than efficacy in everyday language. Usefulness is a versatile word that can be applied to a wide range of situations and objects, while efficacy is more technical and often used in specialized fields such as medicine or research.
Whatโs the difference in the tone of formality between efficacy and usefulness?
Efficacy is often associated with a more technical or formal tone, while usefulness can be used in both formal and informal contexts.
