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, lightlessness, unseeable

Encyclopedia: Lightless

• Hubel
• hubris
• hubristic
• huck
• Huck Finn
• huckaback
• huckleberry
• Huckleberry Finn
• huckleberry oak
• huckster
• HUD
• Huddie Leadbetter
• huddle
• huddle together
• huddled
• huddler
• hudood
• Hudson
• Hudson Bay
• Hudson bay collared lemming
• Hudson Hoagland
• Hudson River
• Hudson River school
• hudson seal
• Hudsonia