Perfidious Definition
pər-fĭdē-əs
adjective
Characterized by perfidy; treacherous.
Webster's New World
Of, pertaining to, or representing perfidy; disloyal to what should command one's fidelity or allegiance.
Wiktionary
Origin of Perfidious
1590s, from Latin perfidiosus "treacherous," from perfidia
From Wiktionary
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