A notorious book is one that is typically known for its scandalous or controversial content. There are several synonyms that can be used to describe such a book, such as infamous, scandalous, disreputable, obscene, or controversial. An infamous book is typically known for being notoriously bad, while a scandalous book can refer to one that is known for its sensational content. A disreputable book is one that has a bad reputation, often due to its content being deemed immoral or inappropriate. An obscene book is one that is considered offensive due to its explicit content, while a controversial book is one that sparks debate or disagreement due to its subject matter.