Not lightened (made lighter in tone or colour).(adjective)
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Use "unlightened" in a sentence
"“Yes,” she said slowly; “and how foolish our human distinctions seem—now,” looking down to the great dead city stretched below, swimming in unlightened shadows."
"It imposes an unlightened way of life on its own adherents and on others."
"You bring home the old adage that an unlightened man can only see himself …"