out of focus
1. Not able to be seen with clear, sharp definition. Someone go tell them that the film is out of focus! I don't need my glasses all the time, but everything is slightly out of focus without them.
2. Not able to produce a clear, sharp image. Who's been messing with my telescope? It's completely out of focus! I've tried adjusting it over and over again, but the projector is still out of focus.
3. Not clearly perceived, understood, or explained. Let's try to bring the discussion back to the topic at hand, because I think things are getting out of focus. As the professor continued rambling on, the point of her lecture started to get out of focus.