Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
blĭtĕus, a, um, adj. [blitum], tasteless, insipid, silly, foolish, useless (ante-class.), Plaut. Truc. 4, 4, 1: belua, Laber. ap. Non. p. 80, 26.