Translation of "Astounding" in French

This is astounding.

C'est renversant.

Astounding, isn't it?

Étonnant, non ?

And the results were astounding.

et les résultats furent stupéfiants.

And at times astounding stupidity.

et parfois d'une stupidité stupéfiante.

What I found astounding is that this experience so dazzling

Ce qui est ahurissant pour moi, c'est que cette expérience si fulgurante