"Fumingly" is an expression used to describe a state of intense anger or frustration. There are several synonyms that can be used in place of "fumingly" to convey the same sense of anger or frustration. Some examples include "fuming," "seething," "livid," "irate," "enraged," "incensed," "wrathful," "infuriated," and "outraged." Each of these synonyms emphasizes a different degree or quality of anger, but all convey a sense of intense emotional turmoil. Whether you are fuming over a personal insult or raging against an injustice, there are plenty of ways to express your anger using powerful synonyms like these.