Etymology
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lightless (adj.)

Old English leohtleas "dark, receiving no light;" see light (n.) + -less.

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Definitions of lightless

lightless (adj.)
giving no light;
lightless stars `visible' only to radio antennae
lightless (adj.)
without illumination;
came up the lightless stairs
Synonyms: unilluminated / unlighted / unlit
From wordnet.princeton.edu