I've asked my English friends about the difference between quite and rather and they've all agreed to say that there's no difference. However in one of my grammar books they say that rather is mainly used with negative ideas. "It's rather cold"
rather difficult, i'm afraid.Let's get a taxi, it's rather a long way to walk.
"She's quite intelligent but rather lazy"
Quite is used with positive ideas and rather with negative ideas.
What do you think?