Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
The word iniucunditas could not be parsed. Trying a normal dictionary lookup:
* injūcundĭtas, ātis, f. [injucundus], unpleasantness: ne quid habeat injucunditatis oratio, Cic. N. D. 2, 55, 138.