How do you say why are doing nothing in French?

There are a few ways to say "why are you doing nothing" in French, depending on the context and level of formality:

Formal:

* Pourquoi ne faites-vous rien ? (This is the most direct translation and is appropriate for formal situations.)

* Pourquoi êtes-vous inactif ? (This is a slightly more formal way of saying "why are you inactive.")

Informal:

* Pourquoi tu ne fais rien ? (This is the most common way to say it in informal situations.)

* Pourquoi tu te laisses aller ? (This is more idiomatic and means "why are you letting yourself go?")

* Pourquoi tu t'ennuies ? (This means "why are you bored?")

In a playful way:

* Qu'est-ce que tu attends ? (This means "what are you waiting for?")

* Tu fais quoi de ton temps ? (This means "what are you doing with your time?")

The best way to choose the right phrase depends on the context of the conversation and the relationship between the speakers.