Most rutilant means the brightest or the most glittering. However, its antonyms signify dullness and dimness. Some of its antonyms include somber, gloomy, lackluster, murky, and sullen. These opposite terms are used to describe things that lack brightness, radiance, or luminosity. For instance, a person's mood can be somber, indicating sadness or depressing thoughts. Lackluster describes something that is uninteresting and doesn't stand out. On the other hand, something that is rutilant catches attention and is eye-catching. In summary, antonyms for most rutilant are words that depict things that are not bright, sparkly or radiant.