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Adjective: lightless  lIt-lus
  1. Giving no light
    "lightless stars 'visible' only to radio antennae"
     
  2. Without illumination
    "came up the lightless stairs";
    - unilluminated, unlighted, unlit

See also: dark, invisible, unseeable

Nearest

lightheartedness
Lighthorse Harry Lee
lighthouse
lighthouse keeper
Lighthouse of Alexandria
lighting
lighting circuit
lighting fixture
lighting industry
lighting-up
lightless
lightlessness
lightly
lightly armored
lightly armoured
lightly-armed
light-minded
light-mindedness
lightness
lightning
lightning arrester