Prevalence is a word used to describe how common something is. A good antonym for prevalence would be rarity, which means something that is uncommon, scarce, or not frequently found. Other antonyms for prevalence include infrequency, unusualness, and rarity. These words describe the opposite of something that is prevalent, which means that it is not common or widespread but instead is a rare occurrence. Antonyms help to create a balanced language and are useful for expressing different shades of meaning. Understanding the antonyms of a word helps to expand our vocabulary and communicate more effectively.