This is a truly off - the - wall question! German's compound - word - building ability is remarkable, yet finding a 40 - letter word for a depressed nihilist worried about surviving the apocalypse seems like a tall order. Perhaps a made - up portmanteau like "Desolat - Weltzweifler - Endzeitüberlebensängster" could fit the bill, though it's not an established term. It's amazing how language can be manipulated to express such intricate ideas. What led you to think about this very specific linguistic need?