it doesn't mean anything; it doesn't make sense
Pour Owen Case, ça ne veut rien dire du tout.
For Owen Case, it means absolutely nothing.
— Insaisissables 2 (2016)
Il a raté son rapport, oui, mais ça ne veut rien dire.
He messed up his report, yes, but that doesn't mean anything.
— Romance de bureau (1977)
Ça ne veut rien dire, n'est-ce pas ?
That doesn’t mean anything, does it?
Franchement, le mariage, ça ne veut rien dire.
Honestly, marriage doesn't mean anything.
— Salé, Sucré (1994)
Tout ça, ça ne veut rien dire.
All this means nothing.
Ça ne veut rien dire, pas vrai ?
That doesn't mean anything, does it?
— Une journée particulière (1977)