Unbridgeable Disparity is a term used to describe a large difference between two things that cannot be reconciled. The term is often used to describe the gap between two groups of people, such as the rich and the poor. In this context, the crossword solution for Unbridgeable Disparity is 'GULF, ' which refers to the large gap between two sides. This term can also be used to describe the differences between two countries or cultures.