Here are some other ways to say no in French, depending on the context:
Formal:
* "Pas du tout" (Not at all)
* "Point du tout" (Not at all)
* "Négatif" (Negative)
Informal:
* "Nan" (Informal, similar to "nope" in English)
* "Non merci" (No thank you)
* "Pas vraiment" (Not really)
Emphasizing your "no":
* "Non, absolument pas" (No, absolutely not)
* "Non, jamais" (No, never)
The best way to say "no" depends on the situation and your relationship with the person you're talking to.