Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
concŭpĭo, ĕre, v. n., to be very desirous, to long much for; as verb finit. (late Lat.), Commod. 64, 4.
Hence, con-cŭpĭens. entis, P. a., very desirous, warmly desiring, coveting (only in the foll. exs.); with gen.: regni, Enn. ap. Cic. Div. 1, 48, 107.
With inf., Capitol. Max. 13, 3.