The phrase "under mad" means to feel or exhibit anger or frustration to an intense degree. Some synonyms for this phrase include "livid," "enraged," "furious," "infuriated," "incensed," "irate," "outraged," and "wrathful." All of these words describe a strong emotional response to a situation or person that has caused distress or harm. While the intensity of these emotions can be overwhelming, it is important to find productive ways to manage and express them in healthy ways. Practices like deep breathing, exercise, and talking to a trusted friend or professional can help manage feelings of being "under mad".