Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
tardĭuscŭlus, a, um, adj. dim. [tardus], somewhat slow, slowish (ante- and postclass.): mulier, Plaut. Fragm. ap. Non. 198, 26: servus, Ter. Heaut. 3, 2, 4.