After reading usage-and-meaning-of-the-word-rather, I had a thought if I could replace rather with "little bit" (it's still in doubt by the way).
What I've known so far (correct me if I'm wrong), rather is used to compare different things like:
it's rather blue than green
or in other words
it's more blue than green.
That's what I know. I tried to find some sentences using "rather" and replaced it with "little bit". Let's see these examples:
It was a rather difficult question. -> It was a little bit difficult question.
I've always rather liked Charlie. -> I've always little bit liked Charlie.
The rules are rather complicated. -> The rules are little bit complicated.
Does it make sense?