Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
in-fortūnātus, a, um, adj., unfortunate (class.): o infortunatum senem, Ter. Eun 2, 3, 7: nihil me infortunatius, Cic. Att. 2, 24, 4: infortunatissimus maritus, App. M. 4, p. 154, 37.