Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
infĭmātis (infŭm-), is, adj. [infimus], one of the lowest (in condition, rank, etc.), opp. summas: ego infumatis infumus, Plaut. Stich. 3, 2, 37; cf. Prisc. 943 P.: infimates ὑστερεύοντες, Gloss.