This is the 431st most frequent French word.
efficace
Effective; efficient.
The word 'efficace' is here used as an adjective to describe how the medication works efficiently to relieve pain.
Ce médicament est très efficace contre la douleur.
This medication is very effective against pain.
In this context, 'efficace' refers to being able to accomplish tasks quickly and effectively.
Il est important d'être efficace lorsqu'on travaille sous pression.
It is important to be efficient when working under pressure.
Here, 'efficace' describes the method's ability to achieve desired outcomes in teaching beginners.