There are living things in this world: humans, animals, trees. One their prominent characteristic is that they all can move in some way on their own.
There are lifeless things that yet can still show some movement or some sort of activeness: robots, cars, waterfalls, lightning, rain, wind, tornadoes, etc.
And there are also things that don't usually show any movement or activity: stones, rocks, tables, pens, a sheet of paper, a glass, a cup, etc.
What adjective should I use to describe the things in the third group? That is, the things that don't have any potential in them for initiating any kind of activity?
Inactive, idle, passive, or anything else?