adjective
1. giving no light
-
lightless stars `visible' only to radio antennae
• Derivationally related forms: ↑lightlessness
2. without illumination
-
came up the lightless stairs
-
the unilluminated side of Mars
-
through dark unlighted (or unlit) streets
• Syn: ↑unilluminated, ↑unlighted, ↑unlit
• Similar to: ↑dark
• Derivationally related forms: ↑lightlessness
Useful english dictionary. 2012.