Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
1. sēbōsus, a, um, adj. [sebum], full of tallow or grease, tallowy, greasy: medulla, Plin. 11, 37, 86, § 214.
2. Sēbōsus, i, m. [1. sebosus], a Roman surname, Cic. Att. 2, 14, 2; 2, 15, 3; Plin. 6, 31, 36, § 201; 9, 15, 17, § 46.