Illegibility is a term used to describe the inability to read or understand something due to its poor handwriting or unclear printing. It is often used in reference to documents, such as legal contracts, that must be legible in order to be valid. The crossword solution for illegibility is 'SCRAWL, ' which is defined as writing or drawing that is done in a hurried or careless manner. This term is often used to describe handwriting that is difficult to read due to its lack of clarity and organization.