What is "gloater"

Usage examples of "gloater".

The old Patrician had never been a gloater, you could say that for him.

I'm not much of a gloater but I'm going to tell you something and then I'm going to then write it down and return it to your bosses, attached to your dead body.

A sympathizer was at best a secret gloater, having always at least some implied claim to be the equal-more like the superior!