je m'en fiche
I don't really care what you think.
Je me fiche un peu de ce que tu penses.
I don't really care about that.
Je m'en fiche un peu.
I don't really care how you do it.
Peu importe vraiment comment tu t’y prends.
To tell the truth, I don't really care.
À vrai dire, je m’en fiche un peu.
I don't really care that much.
Ça ne m’importe pas vraiment tant que ça.