Simple Definition of perfidious
: not able to be trusted : showing that someone cannot be trusted
Full Definition of perfidious
: of, relating to, or characterized by perfidy
Examples of perfidious in a sentence
We were betrayed by a perfidious ally.
<a perfidious campaign worker revealed the senator's strategy to his leading rival for the nomination>
Did You Know?
We wouldn't lie to you about the history of "perfidious" - even though the word itself suggests deceitfulness. The modern English meaning of "perfidious" remains faithful to that of its Latin ancestor, perfidus, which means "faithless." English speakers have used "perfidious" to mean "treacherous" since at least 1572. One of the earliest known uses of the term can be found in Act V, scene iii of Shakespeare’s All's Well That Ends Well: the "perfidious slave" Parolles is thought to be an unreliable witness; he’ll say whatever suits his purpose, whether true or not. In contemporary usage, "perfidious" not only implies treacherousness, but an inability to be reliable or honorable.
First Known Use of perfidious
Synonym Discussion of perfidious
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