Source : Webster's Revised Unabridged Dictionary (1913)

Formless \Form"less\, a.
   Shapeless; without a determinate form; wanting regularity of
   shape. -- {Form"less*ly}, adv. -- {Form"less*ness}, n.

Source : WordNet®

formless
     adj 1: having no definite form or distinct shape; "amorphous clouds
            of insects"; "an aggregate of formless particles"; "a
            shapeless mass of protoplasm" [syn: {amorphous}, {shapeless}]
     2: having no physical form; "belief in a world filled
        with...formless but often malevolent beings"