Semi-despondent fury

In classical mythology, furies were female divinities who punished crimes at the instigation of the victims (250). The term “semi-despondent fury” should not be taken literally. It is, rather, an example of Gilbert’s fondness for wringing humor from the shotgun wedding of incongruous words.

Context: 
I danced a dance like a semi-despondent fury
Act: 
Act