Definify.com

Webster 1913 Edition

Adj.

Destitute or deprived of the sun or its rays; shaded; shadowed.

The sunken glen whose

sunless

shrubs must weep.

Byron.

Adj.

[sun and less.] Destitute of the sun or its rays; shaded.

sunless ‎(comparative more sunless, superlative most sunless)

Without the sun or sunshine; shaded; shadowed.
- 1816, Samuel Taylor Coleridge, Kubla Khan (or, a Vision in a Dream. A Fragment):
  
  In Xanadu did Kubla Khan
  
  A stately pleasure dome decree:
  
  Where Alph, the sacred river, ran
  
  Through caverns measureless to man
  
  Down to a sunless sea.
(figuratively) Dreary, cheerless.
- 1857, Charlotte Brontë, The Professor, ch. 18:
  When I first saw her, her countenance was sunless, her complexion colourless; she looked like one who had no source of enjoyment, no store of bliss anywhere in the world.