The expression "was mad" has several synonyms that can be used to convey a range of emotions. For example, "was angry" is a common synonym that describes a feeling of intense displeasure or hostility. Other synonyms for "was mad" include "was furious," which implies a heightened sense of rage or indignation, and "was incensed," which suggests a feeling of outrage or offense. Likewise, "was livid" conveys a sense of uncontrollable anger or fury. These synonyms can be useful for writers when trying to convey a character's emotions or feelings in a more nuanced way.