Nebulous, adj.

1. Cloudy; misty; foggy; dank. Obsolete. 2. Clouded, turbid, opaque; (Medicine) designating a cornea or corneal lesion that is not transparent. Now rare. 3. Astronomy. Of the nature of a nebula; hazy or indistinct in appearance.

4. That resembles or suggests a nebula or cloud; cloud-like. 5. Vague, indistinct, formless, ill-defined.