PERFIDIOUS
Source: 553, 566, 567
perfidious. perfidious, trayterous, vnfaithfull
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perfidious. Perfidious, a. trecherous, false to trust, base
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Per‐fid″i‐ous (pẽr‐fĭd″ĭ‐ŭs; 277), a. [[L. perfidious.]] 1. 1. Guilty of perfidy; violating good faith or vows; false to trust or confidence reposed; treacherous; faithless; as, a perfidious friend. Shak.
2. 2. Involving, or characterized by, perfidy. “Involved in this perfidious fraud.” Milton.