If you describe someone, especially a girl, as pretty, you mean that they look nice and are attractive in a delicate way.

A place or a thing that is pretty is attractive and pleasant, in a charming but not particularly unusual way.

You can use pretty before an adjective or adverb to mean 'quite' or 'rather'.

Pretty much or pretty well means 'almost'.

If you say that someone is sitting pretty, you mean that they are in a good, safe, or comfortable position.