I am not fluent in French, but I know that just because English has a word that looks like a Latinate one, it doesn't mean we use it the same way. In English, "normal" has two uses. First, it has a kind of insulting meaning, like "boring", "average", etc., as is often captured when people say things like "I don't want to be normal, I want to be unique." When we use it more straightforwardly, we tend to limit it to medical or scientific situations: "My blood pressure is normal." So it feels a little stiff.
Another thing to think about is whether a word's meaning is bent by its sound. In English, "normal" is stressed on its first syllable. NORmul. It kind of just stops there and stands, boringly. But isn't in French it stressed on the second syllable? NurMAAAAAL. It kind of trails off, and by doing so, seems at least to me to convey the meaning of "Oh whatever, c'est la vie, that's just how it goes". So you have to use an English word that also trails off, like goes.