Unable to be seen; out of sight; not visible.
Not appearing on the surface.
Apparently, but not actually, offline.
That is ignored by a person.
To make invisible, to invisiblize.
Existing or operating without involvement by the body; solely mental or intellectual; “ungrounded”, “heady”.
Not united in a regimented structure; lacking structure and order.
Not expressed or exhibited in material or concrete form; wholly abstract.
Not incorporated into a coherent system; conceptually disconnected.
Incorporeal; not possessed of a body.