Having no matter or substance.
So insubstantial as to be irrelevant.
Not expressed or exhibited in material or concrete form; wholly abstract.
Not united in a regimented structure; lacking structure and order.
Existing or operating without involvement by the body; solely mental or intellectual; “ungrounded”, “heady”.
Not incorporated into a coherent system; conceptually disconnected.
Incorporeal; not possessed of a body.