How do you say efficient in french?

The most common and direct translation for "efficient" in French is "efficace".

Here are some other ways to express "efficient" in French, depending on the context:

* Productif: This translates to "productive" and emphasizes the output or results of efficiency.

* Rationnel: This means "rational" and emphasizes the logical and organized approach to efficiency.

* Optimale: This translates to "optimal" and implies the most efficient way to achieve a goal.

* Rapide: This means "fast" and emphasizes the speed and timeliness of efficiency.

The best way to choose the right word depends on the specific context and the nuance you want to convey.