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Definition of lightless : Destitute of light; dark.

Synonyms:

obscured, stygian, tenebrous, darkling, pitchy, without light, unilluminated, darksome, darkish, tenebrific, unseeable, dimmed, pitch-black, caliginous, dusk, unlighted, invisible, unlit, rayless, pitch-dark

dreary, obscure, shadowy, dark, inky, umbrageous, silhouetted, darkened, cloudy, shaded, swarthy, dim, dusky, black, dismal, somber, shady, sooty, murky, gloomy

Usage examples:

• To the East, as I stood there in the quietness of the Sleeping- Time on the One Thousandth Plateau, I heard a far, dreadful sound, down in the lightless East; and, presently, again- a strange, dreadful laughter, deep as a low thunder among the mountains. - "The Night Land", William Hope Hodgson.
• An hour had elapsed; it was now midnight; the moon rode high, a cold white disk against a background of sapphire velvet, its pellucid rays revealing with disheartening distinctness the inanimate and lightless roadside hamlet called Greenfields; its general store and postoffice, its soi- disant hotel, its straggling line of dilapidated habitations, all wrapped in silence profound and impenetrable. - "The Brass Bowl", Louis Joseph Vance.
• Before him in the blackness there was- or perhaps there had been for some time- a blue glow, almost as lightless as the surrounding dark, but blue and physically deep for all that. - "Breaking Point", James E. Gunn.