@missbunnyrabbit
Genuine question - what is wrong with using adverbs? Never heard that before!
Also, I think JK Rowling's prose is great, easy to read and creates a fantastic mental image.
Well, two things, in theory.
"Hello!", she said brightly.
"Nice to see you've finally got here," he answered sarcastically.
"Well if you're going to be like that I won't bother!" she huffed petulantly...
Etc. The theory being that telling a reader all the time exactly how they should read the line is less effective than simply using words that convey sarcasm, brightness, petulance. Readers engage less well with writing when they don't have to do any work at all and it's all spelled out exactly. It also just looks daft.
(note, this isn't a criticism of Rowling - she uses them judiciously)
The second theory is that adverbs weaken sentences. E.g.
The sentence handed down by the judge was monstrously unfair.
vs
The sentence handed down by the judge was unfair.
I used that example specifically because it obviously doesn't weaken the sentence! It can weaken a sentence.
BUT - some people like this advice rather too much. My friend goes to insane contortions to avoid adverbs in her writing, whereas I just noted that plenty of my favourite books got published by using a smattering of adverbs and cracked on with using them as I felt valid.
Publishers will bend the rules for a good story, because a good story trumps all, and the rules are there to be broken.