Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
prae-fĕrox, ōcis, adj., very fierce, bold, violent, impetuous, insolent (perh. not ante-Aug.): praeferoces legatos, Liv. 5, 36; Tac. A. 4, 60: praeferocem ingenio, id. H. 4, 32; 4, 23: multiplici successu praeferocem, Suet. Caes. 35.