"That is a pretty good quote."
Translation:Das ist eine ziemlich gute Quote.
Truth, truth. Context determines a lot, to be sure. The AED says that pretty denotes "moderately high; fairly" when used as an adjective modifier. So clearly it has a range of emphasis. However, I maintain that under no circumstances does the word "pretty" have the same meaning as the word "very". Respectively, they add partial and full emphasis of an adjective.