What is "swotty"

Usage examples of "swotty".

Aunt Petunia always insisted that Dudley was a very gifted boy whose teachers didn’t understand him, while Uncle Vernon maintained that ‘he didn’t want some swotty little nancy boy for a son anyway’.

I mean I cried and everything, but they wanted to keep me off school, which worried me because I didn't like missing lessons, so that should give you some idea of the kind of swotty, cold little freak I was.