Antonyms of adj unilluminated

1 sense of unilluminated

Sense 1
lightless, unilluminated, unlighted, unlit -- (without illumination; "came up the lightless stairs"; "the unilluminated side of Mars"; "through dark unlighted (or unlit) streets")

INDIRECT (VIA dark) -> light -- (characterized by or emitting light; "a room that is light when the shutters are open"; "the inside of the house was airy and light")

Similarity of adj unilluminated

1 sense of unilluminated

Sense 1
lightless, unilluminated, unlighted, unlit -- (without illumination; "came up the lightless stairs"; "the unilluminated side of Mars"; "through dark unlighted (or unlit) streets")
       => dark (vs. light) -- (devoid of or deficient in light or brightness; shadowed or black; "sitting in a dark corner"; "a dark day"; "dark shadows"; "dark as the inside of a black cat")