Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
praemĭōsus, a, um, adj. [praemium], rich (ante-class.): praemiosam, pecuniosam, dixit Cato, Fest. p. 242 Müll.; cf.: praemiosa, pecuniosa, Paul. ex Fest. p. 243 ib.