Rayless \Ray"less\ (r[=a]"l[e^]s), a. Destitute of rays; hence, dark; not illuminated; blind; as, a rayless sky; rayless eyes. [1913 Webster]

Source: The Collaborative International Dictionary of English v.0.48
 

57 Moby Thesaurus words for "rayless": ableptical, amaurotic, beamless, benighted, bereft of light, black, black as night, blind, caliginous, color-blind, dark, dark as night, dark as pitch, darkling, darksome, dim-sighted, ebon, ebony, eclipsed, eyeless, hemeralopic, in darkness, mind-blind, night-black, night-clad, night-cloaked, night-dark, night-enshrouded, night-filled, night-mantled, night-veiled, nyctalopic, obfuscated, obscure, obscured, occulted, pitch-black, pitch-dark, pitchy, sightless, spiritually blind, stark blind, starless, stone-blind, sunless, tenebrious, tenebrose, tenebrous, undiscerning, unenlightened, unilluminated, unlighted, unlit, unobserving, unperceiving, unseeing, visionless

Source: Moby Thesaurus II by Grady Ward, 1.0
 

rayless adj : having no parts resembling rays; not having ray flowers

Source: WordNet (r) 2.0
 

Rayless \Ray"less\, a. Destitute of rays; hence, dark; not illuminated; blind; as, a rayless sky; rayless eyes.

Source: Webster's Revised Unabridged Dictionary (1913)