There are several synonyms for the phrase "does nothing" such as inactive, idle, lazy, sluggish, and unproductive. Inactive implies a state of not taking any action or being dormant, while idle implies a lack of purposeful activity. Lazy is more focused on the lack of effort or willingness to start tasks. Sluggish suggests a slow-moving or lethargic attitude. Unproductive indicates a lack of output or results. In professional contexts, the term "non-performing" may be used to describe someone who is not contributing to their team or organization. In any context, the synonyms for "does nothing" all imply a lack of productivity, action, or progress.