Illumined is a word meaning to shine a light on something or to light up. Synonyms for illumined include illuminated, brightened, lit up, or enlightened. The word illuminated may refer to something being brightly lit, while brightened may refer to something being made more visible or clearer. Lit up is a more casual and colloquial way of referring to illuminating something, while enlightened can refer to shedding light on a situation in a figurative sense. Other synonyms for illumined include irradiated, flooded, and beamed. These words all convey the sense of something being lit up or lit from within, either literally or figuratively.