资料来源 : Webster's Revised Unabridged Dictionary (1913)

Lightless \Light"less\, a.
   Destitute of light; dark. --Shak.

资料来源 : WordNet®

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: {unilluminated}, {unlighted}, {unlit}]