Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
exsultantĭa (exult-), ae, f. [exsulto], a springing up, an attack (post-class.): hostilis, Paul. Nol. Carm. 21, 564; trop.: morbi dolorisque, Gell. 12, 5, 9.