Calescent refers to something that is becoming warm or growing hotter. Its antonyms would be words that describe something that is cooling down or becoming colder. These words could include "frigid," "chilling," "frosty," "frozen," and "below freezing." These antonyms may describe temperatures, weather conditions, or even personalities or emotions. For example, one might describe a person as having a frigid demeanor, indicating that they are aloof or unfriendly. In contrast, someone with a calescent personality might be described as warm, friendly, or passionate. The use of antonyms can help to clarify the meaning of a word and provide additional context to a discussion or written piece.