I.faithlessness, dishonesty, treachery, falsehood, perfidy (class.): “perfidiā deceptus,” Cic. Rosc. Am. 38, 110: “fraude et perfidiā aliquem fallere,” id. ib. 40, 117; id. Fam. 1, 2, 3: “admittere perfidiam in aliquem,” Suet. Caes. 75: “perfidiae tantae (fuit), ut, etc.,” id. Ner. 5: “repens,” Tac. H. 4, 25; Juv. 13, 24.—In plur., Plaut. Capt. 3, 3, 7; id. Ps. 2, 1, 6; Gell. 14, 2, 6.—Of an inanim. thing: “sub ipsis positum labris in acoris perfidiam vinum repente mutari,” Arn. 1, 12.
perfĭdĭa , ae, f. perfidus,