De-calescent refers to the reduction in heat or temperature of something. Its antonyms would be words that indicate an increase in warmth or heat. Some possible antonyms are hot, warm, scorching, blistering, ardent, and sultry. These words convey the sense of intensity and high temperature, which are the opposite of de-calescent. For example, a scorching summer day, a warm cozy fire, or a hot cup of coffee are all antonyms of de-calescent. These words can be used to describe weather conditions, food, beverages, and other items that require an increase in heat or warmth. By using such antonyms, we can create a clear contrast and better express the intended meaning.