A flaming temper is a state of intense anger that inflames the emotions. If you are looking for synonyms, you can use various phrases, such as a boiling rage, a fiery disposition, or a hot-headed mentality. Other options include a ferocious temper, an explosive personality, or a volcanic temper. You can also use phrases such as an irate state, a furious temperament, or an incandescent mood. Regardless of which synonym you choose, make sure you convey the sense of intensity and rapid onset that characterizes a flaming temper.