depthless

From depth + -less.

depthless (not comparable)

1. Having no depth, or having a depth that is impossible to determine; immeasurably deep.
   • 2007 October 19, Holland Cotter, “King-Size Stories, Woven for the Ages”, in New York Times‎^[1]:

     The result is not an image of the natural world in a tapestry but a depiction of nature as a tapestry: a splendid, impenetrable, depthless screen of shivering pixels.

• See Thesaurus:deep