WordReference Random House Learner's Dictionary of American English © 2026
sight•less /ˈsaɪtlɪs/USA pronunciation   adj. 
  1. Ophthalmologyunable to see;
    blind.

WordReference Random House Unabridged Dictionary of American English © 2026
sight•less  (sīt′lis),USA pronunciation adj. 
  1. Pathologyunable to see;
    blind.
  2. invisible.
  • Middle English. See sight, -less 1200–50
sight′less•ly, adv. 
sight′less•ness, n. 


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