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Wiktionary
unilluminated

a. Not illuminated.

WordNet
unilluminated

adj. without illumination; "came up the lightless stairs"; "the unilluminated side of Mars"; "through dark unlighted (or unlit) streets" [syn: lightless, unlighted, unlit]

Usage examples of "unilluminated".

And when all eyes swiveled to make out the lounging figure in the unilluminated bow window, the Bishop of Hatfield inclined his head slightly and smiled.

Like players in a recasting of Poe's "The Murders in the Rue Morgue," they would have to confine their skulking to parks, unilluminated alleyways, balconies, high ledges, parapets, and rooftops.