What makes Lisp difficult to read?

Lisp's syntax, particularly the use of parentheses, makes it difficult to read for some programmers due to its unfamiliarity and the need to understand the context of each parenthesis. This is in contrast to other programming languages that use more traditional syntax. The article highlights the challenges of learning and using Lisp, including the need to understand the concept of prefix notation and the use of multiple parentheses to express complex concepts.