There are a number of antonyms available for the word "up lighted," which essentially means to illuminate or light up. Some of the most common antonyms include dimmed, darkened, shaded, obscured, blacked out, and extinguished. These words signify a decrease in the amount of light or complete lack of it. They are perfect antonyms for "up lighted" and convey the opposite meaning in a powerful yet concise way. Whether you are writing a report, a story, or an academic paper, knowing antonyms for words such as "up lighted" can add more power to your language and make your writing more effective.