We use rather to give emphasis to an
adjective or adverb. It has a similar
meaning to quite when quite is used with
gradable words. It is more formal than
quite.
We often use it to express
something unexpected or
surprising: A: You’re not just
wasting your time here, are you?
B: No, I’m rather busy, in fact.
They walked rather slowly. I’m
afraid I behaved rather badly.
Rather with adjective + noun With a/an we
usually use rather a/an + adjective + noun, but
we can also use a rather + adjective + noun.
With other determiners (some, those) we use
determiner + rather + adjective + noun:
We had to wait rather a long time. (or,
less common, We had to wait a rather
long time.) He helped her out of rather an
uncomfortable situation. (or He helped
her out of a rather uncomfortable
situation.) I had some rather bad news
today. Not: I had rather some bad news
today.