The word "fulgid" means shining or glittering brightly, and its antonyms are words that convey the opposite meaning. The antonyms of "most fulgid" include dim, dull, dimmed, and opaque. These words describe things that lack brightness, clarity, and shine. The antonyms of "most fulgid" can also include somber, gloomy, and shadowy as these words describe surroundings that lack light and are dark in nature. When seeking to describe something that is not shiny or bright, one can opt for any of the antonyms of "most fulgid" to paint a vivid and accurate picture of the subject.