Lazy bone is a colloquial term used to describe a person who is sluggish, lethargic and inactive. Finding appropriate synonyms for lazy bones should not be challenging. Some synonyms for lazy bones include idler, sluggard, sloth, loafer, slacker, drone, couch potato, and shirker. Each word depicts someone who is passive and has no desire to put in the effort or take any action. The words can also be used interchangeably and with minor changes to fit the specific context. Therefore, when referring to lazy bones, there are plenty of options to choose from to ensure variety and avoid repetition.