Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Ballio, ōnis, m., the name of a worthless pimp in the Pseudolus of Plautus; hence, for designating any worthless man, Cic. Phil. 2, 6, 15; id. Rosc. Com. 7, 20.
Whence, Ballĭōnĭus, a, um, adj., of Ballio, Plaut. Ps. 4, 6, 2.