lightless

adjectives

giving no light

"lightless stars `visible' only to radio antennae"

lightless

is derived from

is similar to

impossible or nearly impossible to see; imperceptible by the eye

"the invisible man"; "invisible rays"; "an invisible hinge"; "invisible mending"

without illumination

"came up the lightless stairs"; "the unilluminated side of Mars"; "through dark unlighted (or unlit) streets"

lightless, unilluminated, unlighted, unlit

is derived from