Heavy reading is a term used to describe reading material that is dense, complex, and difficult to understand. The three crossword solutions for the term 'heavy reading' are TOMES (5 letters), TOME (4 letters), and riotact (7 letters). A TOME is a large book, usually one that is scholarly or technical in nature. Riotact is an informal term used to describe a lengthy document or speech that is difficult to understand.