The word "jovialize" means to make someone happy or cheerful. The antonyms for this word can be words that indicate sadness, depression, anger, or stress. Some of the antonyms for "jovialize" include depress, sadden, gloom, discourage, dishearten, anger, irritate, and stress. Using these antonyms in sentences can convey the opposite feeling of cheerfulness. For example, "The news of her father's passing left her feeling depressed," or "The constant nagging from her boss irritated her, leaving her in a bad mood." In contrast, "The surprise party thrown by her friends helped jovialize her mood.