pretty good is a weak way of saying good . Good, but not great. quite good is a strong way of saying good .
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pretty good is a weak way of saying good. Good, but not great.
quite good is a strong way of saying good. Completely good.
At least that's how it is in my American English.
CJ
"Quite" is typically more emphatic than "pretty." Some examples:
He's pretty good at chess. (This would generally mean he's just a little better than average.)
He's quite good at chess. (This would generally means he's very good, much better than average."