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n'en sait rien

know nothing about it; have no idea

→ ne
phrase Uncommon #11,158
know nothing about it; have no idea This expression is usually used with a subject such as elle, on, or personne to mean that the person in question has no knowledge of it. It can also appear in the negative form to emphasize ignorance or uncertainty.
FR: Elle n'en sait rien.
EN: She doesn't know anything about it.

On n'en sait rien Monsieur.

We have no idea, sir.

— Rise Roar Revolt (RRR) (2022)

Non, on n'en sait rien.

No, we don't know anything about that.

On n'en sait rien.

We have no idea.

— Piège de cristal (1988)

Personne n'en sait rien.

Nobody knows anything about it.

Mais on n'en sait rien.

But we don't know anything about it.

Elle n'en sait rien.

She doesn't know anything about it.

Le Maire n'en sait rien, OK ?

The mayor has no idea, okay?

— Do the Right Thing (1989)

Mais ça, pour le moment, elle n'en sait rien.

But for now, she has no idea about that.

— Le Fabuleux Destin d'Amélie Poulain (2001)