Sloth can be a difficult sin to identify. The other capital sins are “active” sins: we consciously choose to do something evil. Sloth is a sin of omission: we fail to do something good. It is easy to dismiss because we’re not actively doing any harm—or so we think.
The account of David committing adultery with Bathsheba opens thus: “In the spring of the year, the time when kings go out to battle, David sent Joab with his officers and all Israel with him; they ravaged the Ammonites, and besieged Rabbah. But David remained at Jerusalem.”
Take note of that last bit, “but David remained in Jerusalem.” That’s where the trouble begins.