lightless

Adjective (2)

1. giving no light“lightless stars ‘visible’ only to radio antennae”Opposite seeableSimilar invisible, unseeable
2. without illumination“came up the lightless stairs”“the unilluminated side of Mars”“through dark unlighted (or unlit) streets”Synonyms: unilluminatedunlightedunlitOpposite lightSimilar dark