Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
dē-fāmātus, a, um, adj. [fama], dishonored, infamous (post-class.): homo turpitudine pristinae vitae defamatissimus, Gell. 18, 3, 3; cf. id. 14, 2, 10: vocabula, id. 9, 2 fin.