There are several antonyms for the phrase "more rayless." Antonyms are words that have opposite meanings. So, if "more rayless" means something that is darker or less radiant, its opposite can mean that something is brighter or more radiant. Some antonyms for "more rayless" include radiant, bright, luminous, dazzling, and brilliant. These words can be used to describe something that is full of light, vibrant or shining. For example, a sunny day can be described as brilliant or radiant, while a dark and gloomy day can be called "more rayless." Antonyms help to add variety and richness in language use.