There are several synonyms for the phrase "doeth nothing" that can be used to describe someone who is idle or inactive. Some of the most common synonyms include "lazes around," "loafs," "idles," "slacks off," "wastes time," "does nothing productive," or "sits around doing nothing." These phrases all suggest a lack of motivation or effort on the part of the person in question. In contrast, synonyms for the opposite of "doeth nothing" might include "works diligently," "stays busy," "accomplishes tasks," or "takes action." Using the appropriate synonyms can help convey a more vivid sense of someone's activity level or productivity.