foedĭfrăgus — Lewis & Short
foedĭfrăgus, a, um, adj.2. foedus + frango,
I 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.