Ci-dessus sont très bons. You can also try : Oxford-Hachette French Dictionary

Le Petit Robert is indisputably the best French dictionary

Well , the best is Larousse. I think it has a very precis explications and exemples . I think it is a little bit expensive to download but i think it worth it :D good luck friend .

I advice you to install Golden Dict, whether it's on your mobile, tablette or computer! It's a free dictionary, empty dictionnary in which you add the files that contain the definitions, and they are free, you can download them. It's free, simple, easy to use and effective! :) The extension of the files is: ".bgl"

I' been using the Le Robert Dixel Mobile for years, it's a great app.