Weighty reading is a term used to describe books that are long and complex, often requiring a great deal of time and effort to read. The two crossword solutions for this term are 'TOMES' (5 letters) and 'TOME' (4 letters). A TOME is a large and scholarly book, usually one that covers a specific subject in great detail. Therefore, the term weighty reading can be used to refer to books that are both lengthy and scholarly.