The phrase "was mad about" is commonly used to describe feelings of anger or frustration towards someone or something. However, there are a variety of synonyms that can be used to convey the same sentiment in a more nuanced way. Some of these alternatives include "was irate about," "was incensed by," "was indignant towards," "was livid with," "was outraged by," and "was seething at." Each of these phrases conveys a sense of intense anger or frustration, but may be more appropriate in certain contexts depending on the tone and severity of the situation. By expanding your vocabulary to include these alternatives, you can better express your emotions and communicate more effectively with others.