Subfuscous is a relatively uncommon word that means dull, dark, or shady. Its antonyms are words that convey opposite meanings to subfuscous. Hence, some possible antonyms for subfuscous are bright, shining, radiant, illuminated, or brilliant. Alternatively, words such as transparent, crystalline, clear, glassy, or limpid can also be used as antonyms for subfuscous. These antonyms are used to describe objects or environments that are bright, clear, or light-filled. Such antonyms of subfuscous are useful in artistic or poetic contexts where vivid language is necessary to convey a specific meaning or feeling.