lightless

Adjective lightless has 2 senses

• lightless(s = adj.all) - giving no light; "lightless stars `visible' only to radio antennae"
Derived form noun lightlessness₁

• lightless(s = adj.all) unilluminated, unlighted, unlit - without illumination; "came up the lightless stairs"; "the unilluminated side of Mars"; "through dark unlighted (or unlit) streets"
Derived form noun lightlessness₁