Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
silvōsus, a, um, adj. [silva], full of woods or trees, woody: saltus, Liv. 9, 2, 7: rami emicant silvosā multitudine, forestlike, Plin. 12, 5, 11, § 23; so, crebrae arbores et silvosae, Vitr. 8, 1 fin.