To the Celtics, "Glamour" was the ability of an evil spirit to throw an ordinary mortal into such a spell that they would do and say anything, including things that went against their nature. It was something considered satanic and scary. A person lost to a "glamour" was thought to be doomed. It was believed they would destroy themselves.
I'd say the Celtics got it right. "Glamour" hasn't changed at all.