There are several synonyms for the term "lazy bum" which can effectively describe a person who is lazy and idle. Some of these include slacker, couch potato, loaf, idler, bum, and do-nothing. These terms can be used to describe individuals who avoid work or physical activity, and instead choose to waste their time doing nothing. Lazy bums may also lack motivation, drive, and enthusiasm, and may struggle with completing tasks or responsibilities. Using these synonyms can help add variety to your vocabulary, and can allow you to effectively communicate the traits or behaviors of a lazy person.