doesn't make sense
Il travaille sur un projet d'hélicoptère qui n'a pas de sens.
He's working on a helicopter project that makes no sense.
— 3 Idiots (2009)
No, that doesn't make sense.
J'imagine que cela n'a pas de sens.
I imagine that doesn't make sense.
Life has no meaning.
This sentence makes no sense.
Ce que vous dites n'a pas de sens.
What you're saying doesn't make any sense.
This message doesn't make sense.