useless trivia: What Word Means: Loses Flavor Or Meaning?

Questions

Fashion: The first widely used synthetic fiber.?

Fast Food: A girl with pig tails, and a white-haired man represent this chain.?

Fast Food: According to Vincent Vega, what is a Big Mac called in France??

Fast Food: McDonald's also sells this Italian food in some markets.?

Fast Food: Sometimes called a Frankfurt, on a bun with cheese,mustard,ketchup etc.?