lightless
- s giving no light
lightless stars `visible' only to radio antennae - s without illumination
came up the lightless stairs
- If the viewer steps back a few paces, the interior spheres look like twin, lightless moons haunting the barren landscape of a science-fiction planet.
- He closed up the "hole" a dungeon of airless, lightless, unfurnished, iron-doored stone cells into which convicts were thrown as punishment for even the most trivial offenses.
- It's no secret that rats which spend much of their lives navigating narrow, often lightless passages need more than a good sense of smell to get around.