My early life Simpsons fandom is a bedrock of my personality to this day. It’s also responsible for me using the word “embiggen” legitimately for longer than I’d like to admit. The show, in its brilliance, was responsible for creating multiple, convincing words. The aforementioned embiggen being one (which is actually now in the dictionary), but my favorite was always courtesy of Ralph Wiggum. Here’s the scene:
I envision “unpossible” as a bit different than impossible. A task being impossible necessarily means that it’s worthwhile to try. You are accepting the reality that the possibility of completing the task exists, but it is just unachievable, unless you are Tom Cruise.