didn't see anything
Ils disent qu'ils n'ont rien vu.
They say they didn’t see anything.
J'ai jamais rien vu d'aussi beau.
I have never seen anything so beautiful.
Il était si rapide que j'ai rien vu.
He was so fast that I didn't see anything.
— The Man From Nowhere (2010)
Je n'ai jamais rien vu de plus beau de ma vie.
I've never seen anything more beautiful in my life.