Effluvious refers to something that has an unpleasant odor or is characterized by noxious emissions. Its antonyms are words that are opposite in meaning to it. The antonyms for effluvious are fragrant, sweet-smelling, aromatic, and perfumed. These words refer to smells that are pleasant or appealing. Other antonyms for effluvious include clean, fresh, and pure, which convey a sense of cleanliness, untainted, or unspoiled. Using these antonyms can help to avoid the negative connotation associated with effluvious and describe something in a positive light, such as a fragrant bouquet of flowers or a clean, fresh environment.