"Pretty" is less extreme than "very."
For example:
If an object is very heavy, it is difficult to lift, maybe impossible.
If it is pretty heavy, it is possible to lift.
2010년 4월 30일
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They have the same meaning. But "pretty" is more casual.
Also, "pretty" is not quite as intense as "very"
If you took a test, and got an 85%, you did "pretty good."
If you took a test, and got a 100%, you did "very good."