Antonyms for the word "are jubilant" include several terms such as unhappy, sad, dejected, low, mournful, and gloomy. When we use language, it is important to understand antonyms as well as synonyms. While the word "jubilant" may indicate happiness or excitement, its antonyms are essential in describing the opposite emotions. For example, if a team lost a game, they would not be jubilant but instead may feel unhappy or dejected. It is important to have a full range of words to describe emotions, and antonyms can help us do that.