Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
foedĭfrăgus, a, um, adj. [2. foedus + frango], league-breaking, perfidious (very rare): Poeni, Cic. Off. 1, 12, 38; cf. Mos. Cic. Rep. Fragm. 2, p. 513 sq.; so, hostes, Laev. ap. Gell. 19, 7, 6: Chaos, Mart. Cap. 9, § 912.