ˈlītlə̇s adjective
Etymology: Middle English lihtles, lightles, from Old English lēohtlēas, from lēoht light + -lēas -less — more at light
1. : receiving no light : without illumination : dark
came up the lightless stairs — James Jones
2. : giving no light
tells us of lightless stars, “visible” only to radio antennae — Scientific American Reader