The word "chthonian" is used to describe something that is related to the underworld or the earth. Therefore, its antonyms would be words that are related to the sky, heavens or the surface of the earth. Some antonyms for "more chthonian" would include: celestial, heavenly, ethereal, aerial, lucid, and radiant. These words connote an atmosphere of beauty, lightness, and hope. They are opposite in meaning to chthonian, which refers to darkness, mystery, and gloom. Antonyms like these are useful in writing as they help to create contrast, build visual imagery, and enhance the reader's understanding of the text.