Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
dūmōsus (also dummosus; old form dusmōsus, like Casmena, Casmili, etc., Liv. Andron. ap. Paul. ex Fest. p. 67, 5 Müll.), a, um, adj. [dumus], full of thornbushes, bushy (rare): rupes, Verg. E. 1, 77; cf. saxa, Ov. M. 10, 535: montes, Col. 4, 33, 5; colles, id. Poët. 10, 150: arva, Verg. G. 2, 180.