This word is acceptable for play in the UK dictionary that is being used in the following games:

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adj. not having been exposed to the sun

Not exposed to the sun; not lighted by the sun; dark; hence, figuratively, not cheered; gloomy.

"Sometimes the sun struck the road, and then it was absolutely hot; then one entered unsunned gorges where the snow lay deep, and the crowded pines made dark twilight, and the river roared under ice bridges fringed by icicles."

bed-linen    unswept    long-wished-for    northwesterly    unaired