If someone accuses you of being perfidious, you should probably be offended it means underhanded, treacherous, deceitful even evil.
Guilty of perfidy; violating good faith or vows; false to trust or confidence reposed; teacherous; faithless;
Adjective S.
tending to betray; especially having a treacherous character as attributed to the Carthaginians by the Romans; "Punic faith"; "the perfidious Judas"; "the fiercest and most treacherous of foes"; "treacherous intrigues"
a.
Guilty of perfidy; violating good faith or vows; false
to trust or confidence reposed; teacherous; faithless; as, a perfidious
friend.
a.
Involving, or characterized by, perfidy.
Perfidious
Guilty of perfidy; violating good faith or vows; false to trust or confidence reposed; teacherous; faithless;
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