Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
suc-căvus (subc-), a, um, adj., hollow below or underneath (ante- and postclass.): areae, Cato, R. R. 151, 3: loca, Lucr. 6, 557; Auct. Limit. pp. 252, 260, 303 Goes.: natura Aetnae, Lucr. 6, 682.