Is glass technicly a solid or a liquid?

Most of you take the obvious answer yes BUT i only want people who know the right answer to give an answer because believe it or not glass doesnt have a definate shape and is considured to many the slowest moving liquid, if you have windows that are decades old feel both sides of the top with both ands and move your way down, it will get fatter as you go down meaning it flowed down over time. But ive heard that a liquid also has to flow at a certain pace in order to be a liquid. If you didnt know glass didnt have a permanent definate shape that could change with no interferance then you just learned somthing from a person asking you a question 🙂