When people are listless, we consider their "get up and go" has "got up and went." They are marked by having low spirits, showing no enthusiasm, or lacking zest or vivacity.
When a ship is listless, she is sitting still and perfectly upright in the water. (Technically, “list” is a static measurement of the ship's angle from being upright while stationary with no external forces. Dynamic forces that cause a ship to move from an upright position create what is referred to as “heel” and may be caused by rudder action, waves or wind.)