Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
jējūnĭtas, ātis, f. [com. ], a fasting, emptiness of stomach. 
- I.  Lit.: jejunitatis plenus, anima foetida, Plaut. Merc. 3, 3, 13. 
- B.  Transf., dryness: calida umoris, Vitr. 2, 6, 4; 7, 4, 3.
- II.  Trop. 
- A.  Of speech, dryness, poverty, meagreness: inopia et jejunitas, Cic. Brut. 55: qui jejunitatem et famem se malle quam ubertatem et copiam dicerent, id. Tusc. 2, 1, 3: jejunitas et siccitas et inopia, id. Brut. 82, 285.
- B.  Ignorance of any thing: bonarum artium, Cic. de Or. 2, 3, 10.