Useless is a common term used to describe things that serve no real purpose. This page on useless is quite ironically useless to most people. Another useless thing is you. I mean you're just sitting here reading this page doing nothing at all constructive. But you sould fix that by writting something. But hey what I am going to do?
Whan definies uselessness? Edit
Something is instantly useless when it stops being useful or having a purpoe. Example ths page started being useless when I started repeating myself over and over. Quite simple really.