Most miasmic refers to something that is extremely polluted or foul-smelling. Antonyms for this word can include words like clean, fresh, pure, and fragrant. Clean refers to something that is free of dirt or contaminants. Fresh is used to describe something new or recently made, as well as something that has a pleasant odor or flavor. Pure means something that is free of impurities or contamination. Fragrant refers to something that has a pleasant smell or aroma. These antonyms are used to describe things that are the opposite of most miasmic, typically referring to something pure, clean, and fresh.