How do you say That makes no sense in french?

There are a few ways to say "That makes no sense" in French, depending on the context and level of formality:

Formal:

* Cela n'a aucun sens. (This has no sense)

* Je ne comprends pas le sens de cela. (I don't understand the meaning of this.)

Informal:

* Ça n'a pas de sens. (That doesn't make sense)

* C'est du n'importe quoi. (It's nonsense.)

* Je ne comprends rien. (I don't understand anything.)

More emphatic:

* C'est complètement absurde. (It's completely absurd.)

* Je ne comprends pas du tout. (I don't understand at all.)

Choose the phrase that best suits the situation and your level of formality.