lightless

from WordNet (r) 3.0 (2006)

lightless
    adj 1: giving no light; "lightless stars `visible' only to radio
           antennae"
    2: without illumination; "came up the lightless stairs"; "the
       unilluminated side of Mars"; "through dark unlighted (or
       unlit) streets" [syn: {lightless}, {unilluminated},
       {unlighted}, {unlit}]

from The Collaborative International Dictionary of English v.0.48

Lightless \Light"less\, a.
   Destitute of light; dark. --Shak.
   [1913 Webster]