Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
lŭtōsus, a, um, adj. [2. lutum], full of mud or loam, muddy, miry, dirty: terra, Cato ap. Plin. 18, 19, 49, § 176: ager, Col. 2, 45: rapa, id. 12, 54 (56), 1.