disapproval If you refer to an organization or system as a monolith, you are critical of it because it is very large and very slow to change, and it does not seem to have different parts with different characters. A deal between the two powerful institutions would have created a banking monolith
A single stone, especially one of large size, shaped into a pillar, statue, or monument
A monolith is a very large, upright piece of stone, especially one that was put in place in ancient times