Antonyms of adj lightless

2 senses of lightless

Sense 1
lightless -- (giving no light; "lightless stars `visible' only to radio antennae")

INDIRECT (VIA invisible) -> visible, seeable -- (capable of being seen; or open to easy view; "a visible object"; "visible stars"; "mountains visible in the distance"; "a visible change of expression"; "visible files")

Sense 2
lightless, unilluminated, unlighted, unlit -- (without illumination; "came up the lightless stairs"; "the unilluminated side of Mars"; "through dark unlighted (or unlit) streets")

INDIRECT (VIA dark) -> light -- (characterized by or emitting light; "a room that is light when the shutters are open"; "the inside of the house was airy and light")

Similarity of adj lightless

2 senses of lightless

Sense 1
lightless -- (giving no light; "lightless stars `visible' only to radio antennae")
       => invisible (vs. visible), unseeable -- (impossible or nearly impossible to see; imperceptible by the eye; "the invisible man"; "invisible rays"; "an invisible hinge"; "invisible mending")

Sense 2
lightless, unilluminated, unlighted, unlit -- (without illumination; "came up the lightless stairs"; "the unilluminated side of Mars"; "through dark unlighted (or unlit) streets")
       => dark (vs. light) -- (devoid of or deficient in light or brightness; shadowed or black; "sitting in a dark corner"; "a dark day"; "dark shadows"; "dark as the inside of a black cat")