Available Definitions:
1) superl. - Pleasing by delicacy or grace; attracting, but not striking or impressing; of a pleasing and attractive form a color; having slight or diminutive beauty; neat or elegant without elevation or grandeur; pleasingly, but not grandly, conceived or expressed; as, a pretty face; a pretty flower; a pretty poem.
2) superl. - Moderately large; considerable; as, he had saved a pretty fortune.
3) superl. - Affectedly nice; foppish; -- used in an ill sense.
4) superl. - Mean; despicable; contemptible; -- used ironically; as, a pretty trick; a pretty fellow.
5) superl. - Stout; strong and brave; intrepid; valiant.
6) adv. - In some degree; moderately; considerably; rather; almost; -- less emphatic than very; as, I am pretty sure of the fact; pretty cold weather.