| lightless | (adj) giving no light, Example: lightless stars `visible' only to radio antennae |
| lightless | (adj) without illumination, Syn. unlit, unlighted, unilluminated, Example: came up the lightless stairs; the unilluminated side of Mars; through dark unlighted (or unlit) streets |
| Lightless | a. Destitute of light; dark. Shak. [ 1913 Webster ] |
| lightlessness | n. total absence of light; blackness. |